HackMD VS ShareLaTex

Their community edition is.

As a fan of "text" I know it. I am running "CodiMD" - this is a selfhosted HackMD for collaborative editing text. This has lots of nice renderers built in for diagrams etc. https://github.com/hackmdio/CodiMD

I was going to suggest CodiMD but it seems these 2 are very similar?

I think this would work. The project HackMD is based off of.

Maybe Codmid https://github.com/hackmdio/codimd

> any popular opensource library using AGPL since?

Not quite a library, but overleaf (the online LaTeX editor) is pretty big in the scientific community and it's agpl.

https://github.com/overleaf/overleaf

btw overleaf is open source - you can easily run it offline inside docker. (download and documentation at https://github.com/overleaf/overleaf )

In their CONTRIBUTING.md file, it includes a section on the CLA that all external contributors need to sign before their code changes are pulled into the main repo:

Thanks, I might need something like this sometime. There's also Overleaf's CLSI.

Since you want a drop-in replacement for Overleaf I would recommend cloning Overleaf and following these instructions to get it running locally. Then enable Git in your overleaf Overleaf for version control.

Would running Overleaf locally make that less cumbersome?

I just remembered there is OverLeaf, which is a web based tool which provides a split view code and compiled version (not dynamic like Lyx). While I haven't done this myself, you can also install it locally overleaf

The Overleaf source code is available online [0], so you could even run your own instance.

[0] https://github.com/overleaf/overleaf

I'd like to suggest Overleaf again since it seems to be exactly what you need. If you don't want to pay for more than one collaborator, you can actually host it yourself. You can add users and administrators as you like (you can also add an SMTP server to allow sending email invitations to collaborators).