Fontman
Most elegant cross platform font manager you will ever use
Fontman is an all in one font management project for all font designers, developers and users, targeting libre/open source fonts. Design and develop your fonts and simply package and ship them using Fontman for universal typefaces seekers.
Fontman follows client-server architecture, a server to track all of font and user data, and a beautiful client application with its front end built with Electron as known as Atom shell and its backend built with Python. Fontman client supports all Linux, Mac and Windows platforms.
The project is hosted on GitHub - https://github.com/fontman and you can see the current development process if you are interested in.