Quake Epsilon is a graphically enhanced build of shareware Quake 1 for Windows/Linux/Mac, which can be upgraded to the full version of Quake along with...
Quake Epsilon is a graphically enhanced build of shareware Quake 1 for Windows/Linux/Mac, which can be upgraded to the full version of Quake along with it's mission packs Scourge of Armagon and Dissolution of Eternity by copying the full-version .pak files into the correct folders.
It's made out of the Darkplaces engine and many mods from members of the Quake One forums and elsewhere (these are listed in the readme for each pack) as well as my own work. If it were not for these people, this build would not exist, so consider thanking the authors directly. These builds are legal and do not contain pirated content. Just simple unzip-and-play stuff.
There are four graphics modes, which you can switch between via a batch file ('High' is the default):
Please note that it runs much faster on Windows, so that would be my platform of choice if you have the option.
I don't want to clutter this summary, so more details and all credits can be found in the readme for each pack and on the homepage (http://www.xpfree.org/epsilon).
At any rate, the v2.52 versions of the build and addons are online, and you can download them at your leisure (or upgrade to them with the handy update patch at the bottom of the downloads page, if you're running v2.5 or v2.51).
Also, the opening map doesn't chug so much CPU now, so you should be alright to run it without getting freaked out by low fps - it's still a heavy-fps count compared to the other maps, but not half as much as it was.
One thing that makes Quake great is it's simplicity. Here's a video which illustrates that (not epsilon build, but funny):
There's one last thing to say, and that is: have fun-