Gobby
Gobby claims to be a realtime collaborative (gosh, I really do not like this word) text editor that runs on Windows, OS X, Linux and other Unixes that run GTK+ 2.6 - that is, SubEthaEdit for all of us. I always wondered why there wasn't a decent cross-platform SubEtha-clone, so I got to try out Gobby really soon. If you also plan trying it, please let me know, so we'll be able to do it jointly.
