KDE: I have made smaller contributions (bugfixes) to KWin and Bluedevil and plan to do more as my free time allows. See my KDE GitLab page for more details.
Own projects
TSTelemetryServer: A cross-platform telemetry plugin for Euro Truck Simulator 2 and American Truck Simulator. Dumps all telemetry data over TCP in JSON.
polybar-kde-desktops: A Python script using DBus to display the current and available KDE virtual desktops in Polybar (or any compatible bar)
CambLMS: Web-based management system originally made for the Hungarian virtual delivery company CambLogistics using F# and WebSharper.