FontDoctor is described as 'is the industry standard software for fixing font problems and organizing font files. Easily locate and eliminate hard-to-find font problems that wreak havoc on computer performance and applications. Diagnostic tool' and is an app in the OS & Utilities category. There are four alternatives to FontDoctor for Windows, Mac and Linux. The best alternative is AFDKO, which is free. Other great apps like FontDoctor are Microsoft Font Validator (Free), Apple Font Tool Suite (Free) and Microsoft Typography (Free).
A tool that evaluates how closely a TrueType or OpenType font adheres to the current font format specification, as well as whether the font meets basic recommendations and deliverable guidelines from Microsoft.
A suite of tools for working with font files. The tools focus on comparing, manipulating, and validating font files that are to be shipped for Apple’s operating systems. Graphical tools includes Blinker, Font Proofer X, and MorxTester.
Internal tools developed at Microsoft for manipulating and creating OpenType and TrueType font files. Used in development of new font toolsets and fonts. The tools includes TTFdump, TrueType Open Assembler, Flint, SBIT32, CacheTT, FastFont, and AddTable.