tools; Decentralised Internet and Privacy; Distributions; Embedded, mobile and automotive; Free Java; Geospatial; Go; Graph Processing; Graphics; HPC, Big Data, and Data Science; Hardware Enablement; Identity and Access Management; Internet of Things; LLVM Toolchain; Legal and Policy Issues; Microkernels; Monitoring and Cloud; Mozilla; MySQL and Friends; Open Document Editors; Open Media; Open Source Design; Package Management; Perl Programming Languages; PostgreSQL; Real Time Communications; Retrocomputing; Rust; SDN and NFV; Software Defined Radio; Software Defined Storage; Source Code Analysis; Testing and automation; Tool the Docs; Virtualization and IaaS. 2019 Keynotes: "Can Anyone Live in Full Software Freedom Today? Confessions of Activists Who Try But Fail to Avoid Proprietary Software" (Bradley M. Kuhn, Karen Sandler), "FLOSS, the Internet and the Future" (Mitchell Baker), "Blockchain: The Ethical Considerations" (Deb Nicholson), "The Cloud is Just Another Sun" (Kyle Rankin), "2019 – Fifty years of Unix and Linux advances" (Jon 'maddog' Hall). DevRooms: .NET and TypeScript; Ada; BSD; Blockchain and Crypto Currencies; CAD and Open Hardware; Collaborative Information and Content Management Applications; Community devroom; Containers; DNS; Decentralized Internet and Privacy; Distributions; Free Java; Free Software Radio; Free Tools and Editors; Geospatial; Go; Graph Processing; Graphics; HPC, Big Data and Data Science; Hardware Enablement; Infra Management; Javascript; LLVM; Legal and Policy Issues; ML on Code; Microkernels and Component-based OS; Minimalistic Languages; Monitoring and Observability; Mozilla; MySQL, MariaDB and Friends; Open Document Editors; Open Media; Open Source Design; PHP & Friends; PostgreSQL; Python; Quantum Computing; RISC-V; Real Time Communications (RTC); Retrocomputing; Rust; Search; Security; Software Defined Networking; Software Defined Storage; Tool the Docs; Virtualization and IaaS. 2020 Keynotes: "The Linux Kernel: We have to finish this thing one day ;) - Solving big problems in small steps for more than two decades" (Thorsten Leemhuis), "FOSSH - 2000 to 2020 and beyond! - maddog continues to pontificate" (Jon 'maddog' Hall), "FOSDEM@20 - A Celebration - The cliché of constant change" (Steven Goodwin) DevRooms: Free Java; Software Defined Networking; DNS; Web Performance; Open Source Computer Aided Modeling and Design; Collaborative Information and Content Management Applications; Coding for Language Communities; Erlang, Elixir and Friends; Graph Processing; Ada; Open Research Tools and Technologies; Open Source Game Development; RISC-V; Retrocomputing; LLVM toolchain; X.Org/Graphics; Hardware-aided Trusted Computing; Confidential Consortium Framework; Open Source Firmware, BMC and Bootloader; Security; Quantum Computing; Legal and Policy Issues; Testing and Automation; Python; Open Document Editors; Backup and Recovery; Dependency Management; Infra Management; Containers; Embedded; JavaScript; Software Defined Storage; Virtualization