Speaking about collaboration, most Linux epoch tools don't have a real collaboration and only synchronize files. Current web apps are much more oriented to conflict-free synchronization. Markdown Tree also is.

Now if you can format branches in Markdown, drag & drop images and other files, keep documentation, study notes, code examples and simultaneously write information with a few more colleagues - that's quite useful I think.

Next version of Markdown Tree should support various embeds like: Youtube, codepen.io, Google maps, etc. That would allow to have a nice workspace for various kinds of tasks. And only web apps are capable of it too.