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Microsoft Font Validator - A tool that evaluates how closely a TrueType or OpenType font adheres to the current font format...
Inconsolata - OSX, Productivity, Design, Typography, powerline, and Fonts
FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
Bitstream Vera Sans Mono - Bitstream Vera Sans Mono Font | dafont.com
Apple Font Tool Suite - A suite of tools for working with font files.