RimStar is a TextEditor for MsWindows? on OS/2 from one of the guys that worked on the original Brief program.
Author: Brain L. Smith
Homepage: http://www.rimstar.com/ (It appears the domain is now unused. Too bad...)
Platforms: Windows, OS/2
License: Shareware
Available: No, though a demo package for the OS/2 version is here: http://hobbes.nmsu.edu/pub/os2/apps/editors/rim22.zip
Screenshot: (OS/2 version)
But this page looks like a fan site: http://macarlo.com/rimstar.htm