Prototypo - Streamlining font creation with open source typeface editor
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
BitFontMaker2™ - Fast and easy Online Bitmap font Editor.
draw.io - Online diagramming application
FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.