There are some programs around that manage their own fonts.
It would be handy if there was some way, they could be helped to discover other fonts on the system.
One way to do this might be to use links - the links might be to the folder, and permit showing files of certain types only. Another way might be to generate a link for each font that "can" be used by the (legacy type) program.
I don't know how this ended up a duplicate of 303. A font repository with a GUI is completely different from downloading misc. fonts and installing them.
Though I really hope that any font repository GUI will help people understand character encoding better.