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Microsoft Font Validator - A tool that evaluates how closely a TrueType or OpenType font adheres to the current font format...
M+ 1m - Download and install the M+ 1m free font family by M+ Fonts as well as test-drive and see a complete character set.
FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
Inconsolata - OSX, Productivity, Design, Typography, powerline, and Fonts
Apple Font Tool Suite - A suite of tools for working with font files.