My contributions ←
^{(non-exhaustive-nor-complete)}

Linux:

Kernel, notably:
- The patch series ALSA: usb-audio: Add quirk for Fiero SC-01 & …(fw v1.0.0);
- drm/edid: Implement DisplayID Type IX & X timing blocks parsing: v1, v2, v3 [1, 2] (for Freedesktop drm/misc issue #55);
BlueZ:
- Cable pairing support for DualSense;
Arch Linux:
- Convinced to install (&| built it for) 12 people to the date, not counting myself;
- Maintainer of multiple AUR packages;
Reverse-engineered DualSense BT Haptics & duplex audio for Linux (and PC in general) gaming;
Developer of the software side for the PinePhone fingerprint reader;
Co-developer of an open-source driver for Goodix fingerprint sensors found in laptops;
Author of multiple GNOME Shell extensions (also some gedit ones on my github);
Contributor of [1, 2, 3, 4] projects aimed at utilizing all features of Huawei & Honor laptops;
more coming...