Unleash - Open source Feature toggle/flag service. Helps developers decrease their time-to-market and to increase learning through experimentation.
FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
Marvel for iOS - Rapid design and prototyping for the iPhone and iPad
FontCreator - This professional font editor allows you to create and edit TrueType and OpenType fonts.
Google Sites - Access Google Sites with a free Google account (for personal use) or G Suite account (for business use).
TruFont - TruFont is a font-editing application written with Python3, ufoLib, defcon and PyQt5.