i occasionally lan party with cs 1.6 and red alert 2 still play doom2 on zandronum (former skulltag engine), with brutal doom mod (lots of blood) or real guns hardcore (call of duty weaponse in doom) nfs 3 hot pursuit was nice warcraft 2, and LOTUS brings back memories
Need for Speed II (1997), Captain Claw (1998), Jazz Jackrabbit 2 (1998), Crime Cities (2000), The Longest Journey (2000), Stunt GP (2001), Max Payne (2001)
My favorite old games would probably be Need for Speed I, Super Mario and a few Pop Cap games. I remember spending almost the entire day just playing these games. Now, I can only spend a few hours in games in a week.
All LucasArts adventures (Day of the Tentacle, Fate of Atlantis, Monkey Islands etc.) and id Software's Wolfensteins, Dooms, Quakes. Also Apogee had very nice games like Wacky Wheels and Raptor.