feel free to complete that list : https://github.com/mistydemeo?tab=repositories&q=saturn https://github.com/hitomi2500 https://github.com/tyranid/saturndebug https://github.com/ijacquez?tab=repositories&q=saturn https://github.com/johannes-fetz https://github.com/andersm?tab=repositories&q=saturn https://github.com/SaturnSDK https://github.com/abrasive?tab=repositories&q=saturn https://github.com/cyberwarriorx https://github.com/studio-lucia https://github.com/doyousketch2?tab=repositories&q=saturn https://github.com/polygon-studio https://github.com/damiendupraz/sega-saturn-dev
You forgot a Frenchie porting FBA to Saturn https://github.com/vbt1/fba_saturn https://github.com/tpunix/SAROO https://github.com/shazz/libyaul-examples https://github.com/devmiyax/yabause
thanks cafe-alpha for pointing them +2 https://github.com/MrConan1/lunardata/ https://github.com/VirtuaSkimmer/
Also https://github.com/MrConan1/CMP_CMPRESS Its meant to be a replacement for the sega proprietary cmprun.exe (Plus you can run it on a 64-bit system)
https://github.com/h1romas4/arduino-saturn-joystick : Convert Sega Saturn controller to USB HID joypad using Arduino Leonardo / Pro Micro.
Sadly, this proyect was going to be the first homebrew Saturn game (except for OfficerSmith). The proyect was abandoned a few months ago, FacundoARG, the creator, anounced it on segasaturno and shared a link with all his work on this proyect, maybe someone can pick up the glove and finish the work. I'll love to have the skills needed for that.