FOSDEM

TLDR

FOSDEM is the world's largest gathering of open source developers and contributors, held free of charge every February at ULB Campus Solbosch in Brussels since 2001.

Overview

FOSDEM (Free and Open Source Software Developers' European Meeting) takes place on the first weekend of February at Universite Libre de Bruxelles. The event is entirely free to attend and requires no registration, making it uniquely accessible.

Each edition draws 8000+ attendees, 1000+ speakers, and 78+ developer rooms covering topics from Linux kernel development to open source security, AI, and web standards. The event is organized entirely by volunteers with no commercial sponsorship dependence.

Since its founding in 2001, FOSDEM has remained a cornerstone of the European open source community and consistently attracts core contributors from most major open source projects.