FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
Unity - The multiplatform game creation tools for everyone.
Glyphs - Make everything from dingbat webfonts to full-fledged text typefaces in the most Mac-like font...
Godot Engine - Feature-packed 2D and 3D open source game engine.
FontCreator - This professional font editor allows you to create and edit TrueType and OpenType fonts.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.