XFree86/OS2
Here is some information about XFree86/OS2 done by Holger Veit. In our opinion one of the best OS/2 projects out there!
X Homepage
If you are looking for informations about X-Lib, this is the source :-)
UnixOS/2
On this server you will find a lot of ports of Unix/Linux applications. This is a very good base to get the most up to date versions.
XFree86/OS2 Download
Primary download locations for the newest OS/2 ports of XFree86/OS2. Mainly provided by Frank Giessler.