UX Flow Wireframe Prototyping System - Create beautiful user flows prototypes for your next project
Prototypo - Streamlining font creation with open source typeface editor
React Proto - React application design and prototyping tool
BitFontMaker2™ - Fast and easy Online Bitmap font Editor.
Userflows - Automatically generate user journeys
FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux