[Lorkki]

Seafile has been working for me as a personal Dropbox replacement, with s3ql for mass storage. It's very light in relation to Nextcloud/Owncloud (a primary criterion for me trying to cheap out on servers), supports WebDAV, role-based access and a bunch of SSO options. The biggest possible drawback I can think of is that it doesn't store files in the plain, so you can't trivially tie in SFTP or serve files from the storage directly.

[WorkLobster]

Re: files in the plain, the server application is bundled with a daemon that allows you to access files locally as a read-only FUSE mount, e.g.:

   seaf-fuse.sh start /mnt/seafile

I find it pretty handy when running a web server on the same host: drop files into a folder on my local machine, and they show up in the web root in seconds!