Vogons (Very old games on new systems) (Forum);http://vogons.zetafleet.com
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Moby Games (Game info site);http://www.mobygames.com
The Legacy (Game info site);http://www.thelegacy.de/
Squakenet.com (Game info site);http://www.squakenet.com/
Free oldies (Game info site);http://www.freeoldies.com
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Apogee/3D Realms (DOS Shareware games);http://www.3drealms.com/downloads.html
Classic DOS Games (DOS Free- and Shareware games);http://www.classicdosgames.com/
Liberated games (Freeware games);http://liberatedgames.org/
Remain in play (Freeware games);http://www.remaininplay.com/
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Wikipedia list of commercial games released as freeware;http://en.wikipedia.org/wiki/List_of_commercial_games_released_as_freeware
Wikipedia list of freeware games;http://en.wikipedia.org/wiki/List_of_freeware_games
Wikipedia list of open source games;http://en.wikipedia.org/wiki/List_of_open_source_games