| 🗓 | April 2-3, 2026 | Xen Spring Meetup 2026 |
| | Université Grenoble Alpes, Grenoble, FR | A two-day, in-person gathering for Xen developers, users, researchers, and ecosystem partners. |
| 🗓 | April 8-10, 2026 | PyCon Lithuania 2026 |
| | TAŠKIUS (mokslo ir menų mokykla), Vilnius, LT | Join 600+ Python developers in Vilnius for the biggest Python and PyData event in the Baltic and Nordic regions. |
| 🗓 | April 9-10, 2026 | jsday 2026 |
| | Hotel Savoia Regency, Bologna, IT | An international conference powered by the Italian web community of GrUSP, jsday brings together developers from all over Europe to share real-world solutions, modern practices, and future-facing ideas. |
| 🗓 | April 10-11, 2026 | Grazer Linuxtage 2026 *NO FEE* |
| | Technische Universität (TU), Graz, AT | Grazer Linuxtage is an annual conference around Open source software and hardware. Participation is free of charge and possible without reservation! |
| 🗓 | April 13-15, 2026 | 2026 EuroLLVM Developers' Meeting |
| | Clayton Hotel Burlington Road, Dublin, IE | The Euro LLVM Developers' Meeting is a bi-annual gathering of the entire LLVM Project community. The conference is organized by the LLVM Foundation and many volunteers within the LLVM community. |
| 🗓 | April 14-17, 2026 | PyCon DE & PyData 2026 |
| | darmstadtium, Darmstadt, DE | Welcome to PyCon DE & PyData - Europe's largest Python community gathering! Connect with over 2,000 AI, data and development professionals (1,500 on site) for an unforgettable celebration of innovation, learning, and the power of open-source. |
| 🗓 | April 15-19, 2026 | DjangoCon Europe 2026 |
| | Athens Conservatoire Ωδείον Αθηνών, Athens Αθήνα, GR | Our conference seeks to educate and develop new skills, best practices, and ideas for the benefit of attendees, developers, speakers, and everyone in our global Django Community, not least those watching the talks online. |
| 🗓 | April 16-18, 2026 | Nerdearla Chile 2026 *NO FEE* |
| | Centro GAM, Santiago, CL | Since 2014, we have organized a 100% free, world-class event in Latin America with high-quality content in technology and open source. |
| 🗓 | April 17-18, 2026 | Congresso esLibre 2026 *NO FEE* |
| | Praza das Universidades, Melide, ES | esLibre is a meeting of people interested in the dissemination of free culture and free technologies. |
| 🗓 | April 18, 2026 | Linuxwochen Eisenstadt 2026 @PyCon Austria *NO FEE* |
| | University of Applied Sciences Burgenland, Eisenstadt, AT | Linuxwochen Eisenstadt gives you the opportunity to get to know the versatility of OpenSource, bring your own knowledge up to date and deepen your experience. The event offers a lecture program, an exhibition area and workshops. |
| 🗓 | April 19-20, 2026 | PyCon Austria *NO FEE* |
| | University of Applied Sciences Burgenland, Eisenstadt, AT | With a focus on beginner-friendly workshops, tutorials, and approachable talks, we aim to bridge the gap between programming beginners and experienced Pythonistas. |
| 🗓 | April 19-25, 2026 | MiniDebCamp + MiniDebConf Campinas 2026 *NO FEE* |
| | Universidade Estadual, Campinas, BR | Welcome to the MiniDebConf Campinas 2026 website - the 7th edition of the largest Brazilian meeting of Debian Project?s users and developers that will take place from April 23th and 25th, 2026, at the State University of Campinas. |
| 🗓 | April 20-21, 2026 | sambaXP 2026 |
| | Hotel FREIZEIT IN, Göttingen, DE | Samba eXPerience is the annual gathering of the Samba Team and its global ecosystem of developers, users, and vendors - organized by SerNet since 2002. |
| 🗓 | April 20-22, 2026 | GrafanaCON 2026 |
| | Palau de Congressos de Catalunya, Barcelona, ES | Come together with hundreds of your open source friends for deep-dive sessions, hands-on labs, inspiring community stories, and a first look at what?s next for Grafana and the LGTM stack. |
| 🗓 | April 20-23, 2026 | SuSECON 2026 |
| | Hilton, Prague, CZ | From keynote speeches to breakout sessions, SuSECON 2025 offers a dynamic lineup of events designed to inspire, educate and connect. |
| 🗓 | April 21-22, 2026 | PostgreSQL Conference Germany 2026 |
| | Haus der Technik, Essen, DE | 10th Annual PostgreSQL Conference Germany. The conference is organised by PostgreSQL Europe to be an important meeting and cooperation point for users both in and out of Europe. |
| 🗓 | April 21-23, 2026 | Open Community Experience - OCX 2026 |
| | The EGG, Brussels, BE | OCX is building on a decade of tradition of connecting top technology thought leaders with the global open source community. |
| 🗓 | April 22-25, 2026 | Libre Graphics Meeting - LGM 2026 |
| | Nürnberg, DE | The Libre Graphics Meeting (LGM) is the annual meeting on free and open source software for graphics. |
| 🗓 | April 23, 2026 | openSuSE Open Developers Summit 2026 - ODS26 |
| | Congress Centre, Prague, CZ | Talks on operating systems and new technologies, cloud and infrastructure, edge and IoT, AI and data, programming languages and toolchains, security and trust, DevOps and automation, community and collaboration, blockchain and decentralized tech, hardware and performance, and the future of open source. |
| 🗓 | April 23-24, 2026 | GodotCon Amsterdam 2026 |
| | Pathé Amsterdam Noord, Amsterdam, NL | The GodotCon is an event which aims to give the Godot community a place to meet in person and exchange knowledge. |
| 🗓 | April 24, 2026 | Open Source Day - OSDay 2026 *NO FEE* |
| | The Social Hub Firenze Belfiore, Florence, IT | Open Source Day is an international conference dedicated to open-source solutions. The event aims to introduce open-source technologies to public and business institutions, promoting them as secure, efficient, and cost-effective alternatives to proprietary software. |
| 🗓 | April 24-26, 2026 | Dani Otvorenih Računarskih Sustava / Croatian Linux Users’ Conference - DORS/CLUC 2026 *NO FEE* |
| | Sveučilište Algebra Bernays, Zagreb, HR | DORS/CLUC is laser-focused on providing actionable knowledge for today?s developers, software architects, and DevOps engineers while also providing a place for businesses to meet and interact with the community. |
| 🗓 | April 25, 2026 | Festival Latinoamericano de Instalación de Software Libre - FLISoL 2026 *NO FEE* |
| | Simultaneously in several
cities in Latin America | FLISoL is the largest Free software promoting event in Latin America and is aimed at all kinds of audiences: students, academics, businessmen, workers, public officials, enthusiasts and even people who do not have much computer knowledge. |
| 🗓 | April 25-26, 2026 | Sesja Linuksowa *NO FEE* |
| | Politechnika Wrocławska, Wrocław, PL | This is the oldest free conference in Poland devoted to Open Source solutions and the latest trends in the GNU/Linux family systems. |
| 🗓 | April 27-28, 2026 | foss-north 2026 |
| | Chalmers Conference Centre, Göteborg, SE | foss-north is a free / open source conference covering both software and hardware from the technical perspective. We provide a meeting place for the Nordic foss communities and will bring together great speakers with great audiences. |
| 🗓 | April 28-May 3, 2026 | EuroBachoTEX 2026 |
| | Bachotek Holiday Retreat, Brodnica, PL | BachoTEX is an annual conference organized by the Polish TEX Users Group - GUST. The aim of the conference is to popularize the TEX computer typesetting system (Plain, LaTEX, ConTEXt, ...) and related software. |
| 🗓 | April 29-May 1, 2026 | openSUSE America Summit - oSAMS26 |
| | Universidad CUC, Barranquilla, CO | The conference aims to highlight free software, open culture, and collaboration across the Americas. |
| 🗓 | April 30, 2026 | PGDay Armenia 2026 |
| | Armenia Marriott Hotel, Yerevan, AM | Join ~200 attendees at the first-ever PGDay Armenia in Yerevan - a community-driven international conference inspired and organized by the Armenia PostgreSQL User Group, and supported by the leading companies in the industry. |
| 🗓 | May 1-3, 2026 | Latch-Up 2026 |
| | University of Waterloo, ON, CA | The Latch-Up conference is a weekend of presentations and networking dedicated to free and open source silicon. |
| 🗓 | May 1-3, 2026 | Wikimedia Hackathon 2026 |
| | voco Milan-Fiere Hotel, Milan, IT | The Wikimedia Hackathon is an annual event that brings the global technical community together to connect and have technical discussions, hack on existing projects and explore new ideas for others. |
| 🗓 | May 2, 2026 | Linux-Infotag Augsburger 2026 *NO FEE* |
| | Technischen Hochschule, Augsburg, DE | The Linux-Infotag Augsburg is a free event where visitors will be able to find out about Linux and open source software, as well as about digital society, creative applications of technology, science and education. |
| 🗓 | May 4-11, 2026 | MiniDebCamp + MiniDebConf Hamburg 2026 *NO FEE* |
| | dock europe/Fux eG (previously called Victoria Kaserne), Hamburg, DE | From 4 May 2026 to 11 of May 2026 there will be a MiniDebConf at dock europe in Hamburg, Germany. |
| 🗓 | May 5, 2026 | PGConf Belgium 2026 *NO FEE* |
| | Hogeschool UC Leuven-Limburg, Campus Proximus, Haasrode, BE | This day is all about PostgreSQL - the world's most advanced open source database. Take the opportunity to meet with other people interested in PostgreSQL in Belgium. |
| 🗓 | May 6-8, 2026 | International Workshop on OpenCL and SYCL - IWOCL 2026 |
| | Technical University of Munich, Heilbronn, DE | IWOCL 2026 marks the 14th anniversary of the annual gathering of the international community of OpenCL and SYCL developers, researchers, implementers, scientists and Khronos Working Group members to share best practice |
| 🗓 | May 7, 2026 | Netherlands UNIX User Group - NLUUG voorjaarsconferentie 2026 |
| | Van der Valk Hotel, Utrecht, NL | NLUUG is the leading association for (professional) developers, administrators, and users of UNIX/Linux, open source, open systems, and open standards in the Netherlands. |
| 🗓 | May 8, 2026 | PyGrunn 2026 |
| | Forum Groningen, NL | pyGrunn is the "Python and friends" developer conference with a local footprint and global mindset. |
| 🗓 | May 8-9, 2026 | Drupal Iberia 2026 |
| | Forum Braga, PT | An ideal and diverse event for anyone interested in Drupal, that combines learning, community, and fun. |
| 🗓 | May 9, 2026 | BSD-NL Conference - Spring 2026 |
| | Brouwerij Maximus, Utrecht, NL | Let's do this again!! It's time, for real, for our fourth conference, held at the Maximus Brewery in Utrecht. There will be talks, hacking, slacking, beer and food. |
| 🗓 | May 14-15, 2026 | phpday 2026 |
| | Hotel San Marco, Verona, IT | The yearly gathering for the European PHP community, since 2003. |
| 🗓 | May 16-17, 2026 | Linux App Summit - LAS 2026 *NO FEE* |
| | Betahaus, Berlin, DE | The Linux App Summit (LAS) brings the global Linux community together to learn, collaborate, and help grow the Linux application ecosystem. Through talks, panels, and Q&A sessions, we encourage attendees to share ideas, make connections, and join our goal of building a common app ecosystem. |
| 🗓 | May 16-17, 2026 | Lomiri Tech Meeting *NO FEE* |
| | OpenSource Science B.V., Tilburg, NL | OS-SCi is set to transform its 135-year-old headquarters at Spoorlaan 400 into a hub of innovation as it hosts the Lomiri Hackathon, a two-day, financially free event for students passionate about open-source mobile development. |
| 🗓 | May 16-17, 2026 | TuxCon 2026 *NO FEE* |
| | Technical University Технически Университет филиал Пловдив ул., Plovdiv Пловдив, BG | TuxCon is an annual event about free and open source software and hardware. The entrance is free for all visitors. TuxCon is a community event and it is organized by volunteers. |
| 🗓 | May 19-22, 2026 | PostgreSQL Development Conference 2026 |
| | Simon Fraser University, Vancouver, BC, CA | PGConf.dev is where users, developers, and community organizers come together to focus on PostgreSQL development and community growth. |
| 🗓 | May 23, 2026 | Open Source Conference Nagoya - OSC2026 *NO FEE* |
| | Trade & Industry Center [Fukiage Hall] 中小企業振興会館 【吹上ホール】, Nagoya 名古屋, JP | Get the latest information happening in the world of open source at OSC2026. All visitors are welcome at this free conference. |
| 🗓 | May 23-24, 2026 | Open Hardware Summit - OHS 2026 |
| | Technische Universität, Berlin, DE | Since 2010, the Open Source Hardware Association, a 501(c)(3) not for profit charity, has hosted the Open Hardware Summit- a comprehensive conference for the open hardware community and the ever changing open source hardware movement. |
| 🗓 | May 27-28, 2026 | Embedded Recipes |
| | Parc Phœnix, Nice, FR | Join core developers and thought leaders of open source software for Embedded Systems. |
| 🗓 | May 27-28, 2026 | Ubuntu Summit 26.04 *NO FEE* |
| | Remote event: live stream from London, GB | The Ubuntu Summit is a showcase for innovation and ambition. |
| 🗓 | May 27-30, 2026 | PyCon Italia 2026 |
| | Savoia Hotel Regency, Bologna, IT | PyCon Italia is the conference dedicated to the Python programming language. |
| 🗓 | May 29-30, 2026 | Newline Hacker Conference *NO FEE* |
| | Stadsmakers, Hackerspace Gent, BE | To celebrate hackerspace.gent and the hacker community once a year, we organize the "Newline" hacker conference. |
| 🗓 | May 29-30, 2026 | PipeWire Hackfest *NO FEE* |
| | Radisson Blu Hotel, Nice, FR | The PipeWire team is going to meet in the city of Nice, France at the end of May. |
| 🗓 | May 29-31, 2026 | Display Next Hackfest *NO FEE* |
| | Radisson Blu Hotel, Nice, FR | The Display Next Hackfest is an event where talented developers gather to explore the latest technologies and trends in the Linux Display Stack. |
| 🗓 | May 29-31, 2026 | GStreamer Spring Hackfest 2026 *NO FEE* |
| | Le LABO, Nice, FR | Join developers, community members, decision-makers, industry partners, researchers, students and anyone else interested in the GStreamer multimedia framework or Open Source and cross-platform multimedia. |
| 🗓 | May 29-31, 2026 | Buildroot Hackathon *NO FEE* |
| | Nice, FR | The Buildroot Hackathon is a 3-day event for Buildroot core developers and contributors. |
| 🗓 | May 30, 2026 | LibreCan 2026 *NO FEE* |
| | Local de Canarias GoRetro, Tenerife, ES | Curious minds about free software, free culture, digital rights and ethical technology in the Canary Islands. |
| 🗓 | May 30, 2026 | XV Poznańska Impreza Wolnego Oprogramowania - P.I.W.O. *NO FEE* |
| | Centrum Wykładowe Politechniki Poznańskiej, Poznań, PL | Poznańska Impreza Wolnego Oprogramowania (P.I.W.O.) or, in English, Poznań Free Software Fest - is a free to attend conference which aims to popularize free, libre and open source software and to promote the GNU/Linux family of operating systems. |
| 🗓 | May 30-31, 2026 | Journées du Logiciel Libre - JdLL 2026 *NO FEE* |
| | l'Ecole Normale Supérieure (ENS) - site René Descartes, Lyon, FR | An active conference since 1998, Journées du Logiciel Libre is a weekend event that welcomes over a thousand visitors: from those who are curious to the curious people from all stripes of life who show up. Whatever your level of knowledge, bring yourself to JdLL and share your ideas; share your projects to build a freer tomorrow. |
| 🗓 | June 1-3, 2026 | OSSConf 2026 *NO FEE* |
| | Žilinská Univerzita v Žiline, SK | The aim of our conference is to provide a space for informing about new developments in open-source software and open technologies, about possibilities for using these tools in science and education |
| 🗓 | June 2-3, 2026 | ObjectWeb and Orientware Conference - OW2Con'26 *NO FEE* |
| | Orange Innovation Gardens, Paris-Châtillon, FR | An international meeting of developpers, IT companies, academics and non-profit organizations, OW2con brings together the entire open source community, during two days of presentations ranging from tech topics to business and ethical issues of open source. |
| 🗓 | June 3-4, 2026 | PG Day France 2026 |
| | Siège de Météo France, Toulouse, FR | The PG Day France is the annual conference of the French-speaking PostgreSQL community. |
| 🗓 | June 5-6, 2026 | #include <conf> 2026 |
| | Berliner Kongresszentrum, Berlin, DE | #include <conf> is Germany's premier C++ conference, bringing together systems programmers, language enthusiasts, and performance engineers for two days of deep technical content. |
| 🗓 | June 6–7, 2026 | Technical Dutch Open Source Event - T-DOSE 2026 *NO FEE* |
| | De Weeffabriek (Centrum Hofdael), Geldrop, NL | T-DOSE is a free and yearly event held in The Netherlands (Eindhoven / Brainport region) to promote use and development of Open Source Software. During this event, Open Source projects, developers and visitors can exchange ideas and knowledge. |
| 🗓 | June 6-8, 2026 | ZüriHac 2026 *NO FEE* |
| | Eastern Switzerland University of Applied Sciences (OST), Rapperswil-Jona campus, SG, CH | ZüriHac is the biggest Haskell community event in the world: a completely free, three-day grassroots coding festival co-organized by the Zürich Friends of Haskell and the OST Eastern Switzerland University of Applied Science. |
| 🗓 | June 14-16, 2026 | Flock to Fedora |
| | OREA Hotel Andel's, Prague, CZ | Flock to Fedora is the premier annual conference for the Fedora Project contributor community. It’s where our contributors come together from around the world to connect, learn, and collaborate. |
| 🗓 | June 16-17, 2026 | Open Source Summit India 2026 |
| | Jio World Convention Centre, Mumbai, Maharashtra, IN | Open Source Summit is the premier event for open source developers, technologists, and community leaders to collaborate, share information, solve problems, and gain knowledge, furthering open source innovation and ensuring a sustainable open source ecosystem. |
| 🗓 | June 17-18, 2026 | FreeBSD Developer Summit 2026 |
| | University of Ottawa, CA | The two-day event takes place June 17-18, 2026, consisting of developer discussion sessions, vendor talks, and working groups. |
| 🗓 | June 17-20, 2026 | BSDCan 2026 |
| | University of Ottawa, CA | BSDCan is the definitive BSD event in North America and welcomes BSD Unix developers, administrators, and users of every level of experience. |
| 🗓 | June 18-20, 2026 | DevConf.CZ *NO FEE* |
| | Vysoké Učení Technické v Brně (VUT), Brno, CZ | DevConf.CZ is an annual, free, Red Hat-sponsored technology conference for users, operators, administrators, and contributors to Free and Open Source technologies. There is no admission or ticket charge for DevConf.CZ events. |
| 🗓 | June 25–26, 2026 | Swiss PGDay 2026 |
| | Eastern Switzerland University of Applied Sciences (OST), Rapperswil-Jona campus, SG, CH | This conference is all about PostgreSQL - the world's most advanced open source database. Take the opportunity to meet with other people interested in PostgreSQL in Switzerland. |
| 🗓 | June 25–27, 2026 | openSuSE Conference - oSC 2026 *NO FEE* |
| | Z-Bau, Nürnberg, DE | The openSUSE Conference is an annual gathering of the openSUSE Project and Open Source Communities. Known as oSC, it features a blend of virtual and in-person presentations as well as workshops and social gatherings. |
| 🗓 | June 26–27, 2026 | OpenSouthCode 2026 *NO FEE* |
| | La Térmica, Málaga, ES | OpenSouthCode is a free event to promote and publicize open technologies: free software/hardware and opensource that has been held in Malaga since 2016. |
| 🗓 | June 27, 2026 | Open Source Conference Hokkaido - OSC2026 *NO FEE* |
| | Sapporo Business Inovation Center 札幌市産業振興センタ, Hokkaido 北海道, JP | Get the latest information happening in the world of open source at OSC2026. All visitors are welcome at this free conference. |
| 🗓 | June 30–July 2, 2026 | Pass the SALT - PTS2026 *NO FEE* |
| | Université Catholique, Lille, FR | A totally free, english spoken conference dedicated to free software & security. |
| 🗓 | July 4, 2026 | Tübix Linuxtag *NO FEE* |
| | Wilhelm-Schickard-Institut für Informatik, Tübingen, DE | The Tübix could be something for you if you: - want to learn something from others - want to show or teach others something - are an expert / professional / veteran / master - are a newbie / beginner / switcher / interested party - want to visit a computer museum at the same time. |
| 🗓 | July 6–8, 2026 | Free Silicon Conference - FSiC2026 |
| | University of Ljubljana, SI | The conference will connect experts and enthusiasts who want to build a complete free and open-ource CAD ecosystem for designing analog and digital integrated circuits. |
| 🗓 | July 13-16, 2026 | Netdev 0x1A |
| | Università Roma TRE - Via Ostiense, Rome, IT | A conference of the netdev community, by the netdev community, for the netdev community. Linux kernel networking and user space utilization of the interfaces to the Linux kernel networking subsystem are the focus. |
| 🗓 | July 13-19, 2026 | EuroPython 2026 |
| | ICE, Kraków, PL | Since 2002, from humble beginnings in Charleroi, Belgium, EuroPython has brought together thousands of developers, enthusiasts, and innovators from around the globe. |
| 🗓 | July 13-19, 2026 | DebCamp26 |
| | Universidad Nacional del Litoral (UNL), Santa Fe, AR | DebCamp is the hacking session right before DebConf. DebCamp usually occurs in the week before DebConf itself. It’s a week for Debian contributors to focus on their Debian-related projects, tasks, or problems uninterrupted. |
| 🗓 | July 16-21, 2026 | GNOME Users And Developers European Conference - GUADEC 2026 |
| | Universidade da Coruña, ES | GUADEC is the GNOME community's largest conference, bringing together hundreds of users, contributors, community members, and enthusiastic supporters for a week of talks and workshops. |
| 🗓 | July 17-19, 2026 | International TeX Users Group - TUG 2025: 46th annual meeting |
| | Alt Hotel Calgary East Village, Calgary, CA | Presentations covering the TeX world. |
| 🗓 | July 18-23, 2026 | EuroSciPy 2025 |
| | AGH University of Kraków, PL | The EuroSciPy meeting is a cross-disciplinary gathering focused on the use and development of the Python language in scientific research. |
| 🗓 | July 20-25, 2026 | DebConf26 |
| | Universidad Nacional del Litoral (UNL), Santa Fe, AR | DebConf is the annual conference for Debian contributors and users interested in improving Debian. Previous Debian conferences have featured speakers and attendees from all around the world. |
| | |