The binaries and source code can be found at:
http://www.os2site.com/sw/incoming/onscreen2_211.zip
Thanks to John Allen for making it open source.
(Moderators Note: For some reasson I can not connect in a long while to hobbes ftp, I think my geography is banned from the server. Please help me out to upload the file to hobbes too. Here it is the upload txt.)