MusicBrainz Picard is a cross-platform (Linux, macOS, Windows) audio tagging application.
Health
Track your fitness goals.
Linwood Butterfly
Powerful, minimalistic, cross-platform, opensource note-taking app.
Metronome
Simple metronome for all musicians that helps to practice several rythms at many speeds
Core PDF
A simple lightweight PDF viewer.
Obfuscate
Censor private information.
Carla
Carla is a fully-featured modular audio plugin host, with support for many audio drivers and plugin formats.
Gaphor
Gaphor is a UML and SysML modeling application written in Python. It is designed to be easy to use, while still being powerful
Core Paint
A paint app for C Suite.
Tropy
Research photo management.