PrivMX

[seeker]

An interested team/project management collaboration platform with an emphasis on security. Not sure how mature it is. Server-Client model with with Windows/Mac/Linux applications

Features/Tools
https://privmx.com/en/tools

PrivMX
https://privmx.com/en
PrivMX stands for Private Mind Exchange – a humanistic concept that we see as extremely important in the XXI century.
One Private digital workspace
One applications with all the tools for your team needs
One dedicated team server with all your teams data
End-to-End Encryption used always, for all your data
Zero-Knowledge Servers in PrivMX Cloud or self-hosted
Open Source Code for maximum transparency

Install wiki:
https://dev.privmx.com/main/docs/-/wikis/home

Looks like it was recently open sourced:
https://privmx.com/en/blog/20/from-now-on-privmx-is-free-and-open