The most current version is 007.4, released by Fritz on December 10, 2012.
Windows 7zip file
Full source code (Requires MinGW or some version of *NIX to compile)
FreeDoom 0.7 using ObHack-generated maps (Based on FreeDoom 0.7 because that is the most recent version not to crash Doomsday 1.8.3)
Screenshot playing an ObHack-generated map
This software is no longer supported by me; I don't answer emails about the program, nor do I add features or fix bugs. Fritz is the current maintainer. Support for ObHack may or may not be found here:
Older releases of ObHack (and SLUMP) can be seen here