http://weilbacher.org/Mozilla/builds.html
Also available (11/24/2004) is an OS/2 build of the latest development version, Mozilla 1.8 alpha 5.
http://ftp.mozilla.org/pub/mozilla.org/mozilla/releases/mozilla1.8a5/contrib/
These builds require a GCC runtime.
http://download.innotek.de/gccos2/runtime/libc-0.5.1.exe
See my Warpzilla tips page for more information.
http://www.os2bbs.com/os2news/Warpzilla.html
Source: OS/2 Warp News and Rumors