So far I’ve got:
PSO (the 2001 v2 Asia release for windows)
PSOBB (playing on the Epinea server)
SADX (modded)
Crazy Taxi, Sega Bass Fishing and Space Channel 5 in a compilation
Grandia II (GOG)
Omicron (GOG)
I’m reliving the best time of my life, my tweens, during the collapse of the american empire! (God willing)
Jet Set Radio, Sonic adventure DX & 2 count too. Also Marvel vs Capcom 2 kinda counts, its first release was arcade but dreamcast was its first console. That and Power Stone are available on PC from a couple of the recent capcom fighting collections