Unity - The multiplatform game creation tools for everyone.
Microsoft Font Validator - A tool that evaluates how closely a TrueType or OpenType font adheres to the current font format...
Godot Engine - Feature-packed 2D and 3D open source game engine.
FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Apple Font Tool Suite - A suite of tools for working with font files.