Microsoft Font Validator - A tool that evaluates how closely a TrueType or OpenType font adheres to the current font format...
Linotype FontExplorer X Pro - Linotype FontExplorer X Pro is a font manager for the Mac and Windows operating systems that is integrated with an online store that allows you browse through fonts you are looking to buy.
Vectr - Free vector graphics editor. A simple yet powerful web and desktop cross-platform tool for everyone.
Connect Fonts Powered By Suitcase - A flexible font manager that uplevels the classic desktop application with intuitive search, pairing suggestions, and remote access in the cloud to keep you inspired, no matter where you are.
FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
NexusFont - Choose and manage your fonts with Nexus Font.