www.freeprogrammingresources.com

Free PC Games

acid-play.com
Freeware games site.

remaininplay.com
Tries to catalog all commercial games that have been turned into freeware games by their copyright owners.(sometimes source only)

www.free-games-net.com
Click the games link on the horizontal menu for a full list of the free games available.

www.freewaregames.net
Freeware games with direct downloads, reviews, and top picks.

GameHippo.com
Freeware and open-source games to download.

Free Computer Games A-Z
A lot of these are demos or shareware, but there are some free ones too.

Free-Games.as
Archive of freeware pc games, sorted into 12 categories.

megagames.com
An index of games including freeware, demos, cheats, trailers, etc.