If you are looking for the absolutely latest version, grab mochadoom-alpha-16.zip.
You will still need to provide an IWAD in order to play, and a computer with a Java
Runtime Environment compatible with Oracle/Sun's JRE 6.
A fast graphics card and sound are recommended. Compatible with most major OSes.
Tested on Microsoft Linux, Ubuntu Linux and Mac OS X.
If you are interested in the source code, visit the public CVS: