FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
Whimsical Wireframes - Lightning fast wireframing with real-time collaboration.
FontCreator - This professional font editor allows you to create and edit TrueType and OpenType fonts.
Adobe XD - Adobe XD is an all-in-one UX/UI solution for designing websites, mobile apps and more.
TruFont - TruFont is a font-editing application written with Python3, ufoLib, defcon and PyQt5.
Userflows - Automatically generate user journeys