GDM Settings
A settings app for GNOME's Login Manager, GDM
DB Browser for SQLite
High quality, visual, open source tool to create, design, and edit database files compatible with SQLite
Notes
Notes is an open source and cross-platform note-taking app that is both beautiful and powerful
Moonlight
Moonlight PC is an open source PC client for NVIDIA GameStream and Sunshine.
Wezterm
GPU-accelerated cross-platform terminal emulator and multiplexer
ksnip
ksnip the cross-platform screenshot and annotation tool
Freac
Free and open source audio converter
MyPaint
A fast and dead-simple painting app for artists