KNova

For me it’s 100% Nextcloud. It was a pain to get working at first (and I’m dreading the day it breaks, if that happens). But it is so much more than just a self-hosted Dropbox solution:

• Maps
• Calendar
• Email
• Markdown editor (I’m using this to try and replace Google Drive for collaborative document editing with my friends; most of what we need can be achieved with Markdown formatting)
• I haven’t tried it but there is a Talk plugin that allows for video conferencing in browser;
• a bunch of other stuff I’ve never played with like mind maps, PDF conversion, music player, etc.