You could try yunohost on the server side. (Not docker based and beginner friendly)
You might want to look at ITflow. Despite the name, it is really a generic tool for businesses or associations, not IT. Foss and here’s a demo
Yunohost is beginner friendly
EFF every now and then https://www.eff.org/fr/pages/donate-eff
Still waiting to see any consequence on simplemobiletools