Whimsical Wireframes - Lightning fast wireframing with real-time collaboration.
FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
Adobe XD - Adobe XD is an all-in-one UX/UI solution for designing websites, mobile apps and more.
FontCreator - This professional font editor allows you to create and edit TrueType and OpenType fonts.
Userflows - Automatically generate user journeys
Glyphs - Make everything from dingbat webfonts to full-fledged text typefaces in the most Mac-like font...