UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Prototypo - Streamlining font creation with open source typeface editor
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
BitFontMaker2™ - Fast and easy Online Bitmap font Editor.
Moqups - The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project
FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux