If you read Slashdot, then you may have heard of a site that launched this week going by the name of Liberated Games. If you haven't heard of this site until now, you're probably wondering what's up.
Well, it's a site dedicated to cataloguing commercial games that have either been fully released for free(as in gratis), or have been open sourced. The latter are a bit trickier in that usually the game data is not "liberated" with the source code. In layman's terms, you still need to own the original game. In some cases, there are people trying to create game data to compliment the open sourced engines, like FreeDOOM or Open Quartz(content for Quake engines). Now you may be wondering, for every other game that has no project trying to provide free game data, what is the point of these liberated engines? Well, take a look at my post regarding the Doomsday engine a couple of weeks ago and you'll start to get the hint. Most of the time, the entire point is to allow the game to run on an operating system that wasn't originally supported, or to add snazzy new graphical features(or both).
I haven't really had that much of a chance this week to download and try anything, but my next move will probably be to pick up ScummVM and play around with some old school graphic adventures.