Many small games such as Tetris or Pacman variants are released as freeware, and some older games are released as 'abandonware' - games that can be freely redistributed but are no longer supported by the developers. All of which means more fun, for you, for free!
There's something for everyone here in 1Up.com's list of 101 games that won't cost you a penny.
DX-Ball is a great Breakout clone. It was written way back in 1998, but it's still an entertaining game.
Click here to download.
The first and second games in the massively popular GTA series have now been released as abandonware. These classic games, though old, are still great fun and very playable. Note the 18+ age certificate.
GTA download page | GTA2 download page
(free registration required to download)
Pacman is one of the oldest video games there is. Here's a simple version - just download the program and run it, no installation is required.
Click here to download.
RtCW: Enemy Territory is one of the more famed freeware games out there. It holds its own well in a crowded WWII FPS genre, with well-balanced squad play and unique features such as the ability to steal enemy uniforms.
Linux users will be pleased to find that there is a native Linux client.
Return to Castle Wolfenstein website
The quintessential arcade video game. This tiny (10kb) version is designed to perfectly emulate the arcade machines.
Nostalgia-inducing stuff.
Click here to download.
Tetris is another of the all-time classic computer games, making its debut on the Commodore 64 in the early 80s.
Tetrix takes the game into the next generation, incorporating skins, internet action, and a host of other cool features.