Microsoft Font Validator - A tool that evaluates how closely a TrueType or OpenType font adheres to the current font format...
RealityMAX - RealityMAX is the most powerful free 3D design collaboration platform, 100% online. Cooperate remotely with your colleagues on 3D projects and easily share your work with clients. Create Web3D and AR experiences in a snap, without a line of code.
FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
Cadbull - Cadbull is a website that comes with an advanced collection of CAD blocks and DWG design, facilitating architects and designers to get done with their projects efficiently.
Apple Font Tool Suite - A suite of tools for working with font files.
DWGFREE - DWGFREE is an online platform that comes with a comprehensive collection of CAD blocks that can be downloaded without the need for registration.