Classic video game sprites of all kinds can be found here. They make great icons.
Overwatch sound files, playable online.
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An opensource turn-based strategy game based on OpenGL. There are versions for all of the usual OSS operating systems, and Window, too.
Everyone's favorite t-shirts from the 80's.
Free downloads of older shareware and abandonware games, applications, and utilities.
A portal site of Linux games of various and sundry kinds.
Someone fed ROM dumps from a couple of Atari games into distellamap and generated maps of function calls, with sprite dumps. Amazing, how simple games were back then...
An open source clone of the game Worms in which you manipulate a team of characters (usually earthworms) to box, pummel, blow up, and otherwise mangle the characters of the other team in a cartoon-like fashion. Network/deathmatch play possible.