Peter Moylan has released Web Family Tree 2.1, the only actively-developed genealogy program for OS/2 (that I am aware of). It is a program that displays your family tree online, using a GEDCOM file.
You will need a machine running OS/2 or eCS (eComStation) or Blue Lion. eCS and Blue Lion are both OS/2 distributions licensed from IBM. I spent a lot of time on OS/2, both personally and professionally so I was delighted to see this pop up.
The program can be downloaded, along with a demo of the output, from:
http://www.pmoylan.org/pages/os2/wft.html