This repository showcases examples and implementation tips for user-interface elements that provide access to OpenType fonts.
In particular, it focuses on user experiences beyond the generic font-chooser menu, including:
This information is intended to be useful for open-source and free-software projects, and all of the applications discussed in the examples are free and open-source.
However ... this information is free for everyone to study and draw inspiration from, regardless of what sort of project (if any) they may be working on.