I’d like to share something I’ve been working on recently:
https://github.com/thefinalcutbg/QDento
This software is based on DinoDent- a free open-source software I originally built for Bulgarian dental clinics. DinoDent has grown a lot over the past 3 years, however, since it is tightly connected to the Bulgarian healthcare system, I decided to create a clean international version. It's main purpose is to serve as a basis for development of custom software solution for dental practices in other countries, but even in its current shape it should be totally usable :)