XDM is running on this rare machine with Baikal CPU (pt.2) news - XDM mod for Half-Life
XDM is written with portability and compatibility in mind. Since most of the time it was played as a Half-Life mod, which is a Win32 x86 platform, it wasn't noticed by most. But now, when Xash3D has matured enough, it pays off! (part 2)
Source: moddb.com