I played half life on a packard bell 486 DX2 66 MHz with 88 MB ram and 8 MB Monster GFX card. The CPU had been upgraded to a 586 133 MHz overclocked chip. But at 640X480 some section were like a slide show.
Mech Warrior 2 will play maybe 3 will also.
WOW 2 This may have just been called warcraft 2.
TA 1 and 2
Id consider finding win 98 for that rig and playing a load of games that never ran well with xp - the CD editions of tie fighter and xwing rebel alliance etc, Theres tons of good games that never worked under xp, and your hardware on that machine would be great for those sort of games.