ShareLaTex VS cocalc-docker

you can already self host it https://github.com/overleaf/overleaf

Mostly open source... Here's the repo: https://github.com/overleaf/overleaf. But you can see what features are only available in the paid versions here

Overleaf's license. I highly suggest reading point 10. I only skimmed it, but there are probably other pertinent details.

Look at the project license: https://github.com/overleaf/overleaf/blob/main/LICENSE

the linked repo is archived and it states, it has been merged into overleaf/overleaf

The Overleaf Community Edition is a lite version of our LaTeX editing platform which can be freely self-installed (see https://github.com/overleaf/overleaf for details); and Server Pro is our full, officially supported, paid service. Server Pro is an excellent option for organizations that are looking for the ease and functionality of the Overleaf platform, but require a solution that sits behind a firewall.

I recently discovered Sagemath CoCalc.

You can download and use cocalc for free via a docker image: https://github.com/sagemathinc/cocalc-docker

I am the CEO of CoCalc, which is an alternatives to Overleaf that they don't own. I don't know whether or not our rules about personal data collection are compatible with your university requirements. Our default rules are at https://cocalc.com/policies, but we have been able to make modifications to them for particular customers. We also have a small easy to install on premises version here https://github.com/sagemathinc/cocalc-docker, and sell a more complicated Kubernetes-based on prem version of our software, so you control all data. Please feel free to email [[email protected]](mailto:[email protected]) with more detailed questions. In particular, it could be that we've already worked with your university to use CoCalc for collaborative Jupyter notebooks for teaching (that's the main thing CoCalc is used for, not latex), and that's something we can discuss in our support channels.

Mail - probably with mailu; and a multimedia server, but I haven't decided yet which one zenphoto? piwigo? lychee? or others?). Maybe seafile, although I probably don't need it given my use now of Syncthing and a backup strategy. And maybe... CoCalc (https://github.com/sagemathinc/cocalc-docker) as it'd be great to be able to run this from any machine, rather than having to manage software for different platforms.