id Software decides to push out a "cease and desist" order on this but while its there it's certainly cool to play. The Newgrounds web site has got a triple play of the original Doom, along with Doom engine games Heretic and Hexen, available to play for free via their Flash-based browser site.
The programmer who ported these games is simply called 'mike' online and he's done a terrific job of getting all three games to run well (although it does require the new Flash 10; sorry, other web browsers). He's been working on this for a while now under the radar but we suspect that since id still sells these games they won't take too kindly to having them available to play for free; that's what Quake Live is for.
[Via Rock, Paper, Shotgun]