2002 was the 20th anniversary of "PAM", the
Atari 5200 Supersystem.
Atari 5200 development brought us four homebrews in the year 2002:
Ronen Habot's Castle Blast,
Mean Hamster Software's Haunted House II and Combat II, and my own game Koffi: Yellow Kopter.
Mean Hamster's 5200 Klax homebrew
was released in 2003.
And in 2004, in addition to a slew of Atari 8bit
ports to the 5200 including Donkey Kong and DK Jr, Castle Crisis was released,
which is an excellent arcade-perfect port of coin-op Warlords!
Good luck finding some of these; Atari (formerly "Infogrames") has requested
all those which infringe on their Intellectual Properties be discontinued. This
happened in September 2004.