GNU Radio 4.0.0 Release Candidate 3 (RC3) is now available! While this release brings significant improvements to the runtime, expanded signal processing capabilities, and continued progress on developer tooling, it also marks an important milestone for the GNU Radio project: RC3 is the first GNU Radio 4 release candidate maintained by the broader GNU Radio community.
Software-defined radio (SDR) has become a foundational technology across radar, electronic warfare (EW), spectrum monitoring, counter-UAS, and advanced wireless communications systems. Its flexibility allows engineers to rapidly develop, test, and refine new capabilities without being constrained by fixed-function hardware. Yet while SDR enables rapid innovation in the lab, transitioning those capabilities into deployed systems introduces a distinct set of challenges that can impact performance, development timelines, and long-term adaptability.
We have been working hard getting GNU Radio 4 ready for an official release. Part of this endeavor has been restructuring and refactoring the repositories for future maintainability, better build and CI efficiency, and the flexibility to support different licensing models across the ecosystem. GNU Radio 4 is now organized around a super-repo builder capable of pulling together foundational projects such as the core runtime and key DSP libraries, modules containing both official and experimental blocks, and applications built on top of them.
The European GNU Radio Days will be held in Rennes, France, from November 16 to November 18, 2026. The event aims to bring together the European SDR community around scientific presentations, technical feedback, tutorials, demonstrations, educational materials for students, and discussions on the evolution of open radio technologies. This new edition of the European GNU Radio Days will focus on cybersecurity with SDR.
Mailing List: discuss-gnuradio
Matrix: #gnuradio:gnuradio.org
IRC: #gnuradio on libera.chat
Bug Reports: Github Issue Tracker (not for usage questions)
