Smile
Smile – simple emoji picker for linux with custom tags support. Free and open source program
Glyphtracer is a program for converting images of letters into a font. Free and open source program
FontFinder is a free and open source application for viewing and installing fonts from the Google Font Archive
Fontmatrix is a free and open source simple font management application
Font Manager is a free and open source simple font management application for GTK+ desktop environments
AppImagePool is a free and open source simple, modern AppImageHub client