Because I find them useful.
And also I never pay for paid software (at least not directly).
Linux Mint
Manjaro
Tor Project
The Document Foundation (LibreOffice)
Arch Linux
KDE
Mozilla
F-Droid
Termux
db0 Lemmy instance (lemmy.dbzer0.com)
Arne Schwabe (dev of Android OVPN client)
Deluan Quintao (dev of Navidrome server)
Arty Bishop (dev of Look4Sat)
sc07 (Fediverse Canvas creator)
Markus Fisch (dev of Binary Eye)
VideoLAN
Meshtastic
Kiwix
FFmpeg
IzzyOnDroid
Lemmy
Because I find them useful.
And also I never pay for paid software (at least not directly).