links to legally freely available software 

gp32x home of up to date gp2x news and downloads plus a great forum - where a i got most of my gba roms

hermit games - great psx

zophar - has homebrew roms for various systems. got some roms from here - compo to write really small games. got some good stuff for atari 2600 and c64 here - home of jeff minter's insanity

the new dimension - lots of great c64 games here