It's been a few years but I had a client that needed some secure remote file access capability "like DropBox" so I spun up an ownCloud VM and it had a surprisin

It's been a few years but I had a client that needed some secure remote file access capability "like DropBox" so I spun up an ownCloud VM and it had a surprising amount of collaboration tools built-in. It had all the groups, permissions, sharing, etc stuff you'd expect, and you could open and edit Office documents in the browser (it was a web-based Zoho Word/Excel type editor if I remember correctly.) It also had automatic versioning so if someone jacked up one of the files, they could roll back to whenever. For anyone looking for that sort of thing, ownCloud might not seem like an obvious choice but I was pleasantly surprised.