Pixel-Web part 1 - free
4 icons
Free for commercial use (Include link to authors website)
8-Bit
Free
21 icons
Free for commercial use (Include link to authors website)
Pixel House
3 icons
Free for commercial use (Include link to authors website)
Sanscons
119 icons
Free for commercial use (Include link to authors website)
Farm-fresh
3,017 icons
Free for commercial use (Include link to authors website)