If you want to go through several hours of compiling and several hundred megabytes of dependencies, with your fingers crossed that things won’t inexplicably break 3 hours in, feel free to try to install Gobby on a Mac. Personally, I’ll stick to SubEthaEdit, or whatever web-based editor, if I need collaboration.
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I really think desktop collaborative editors should try to provide a web-based alternative front-end, for just this reason, that it’s nice for everyone to be able to contribute, and there’s no better way to ensure that than through the web.
It says it even works with Gobby.