Sketch - Professional digital design for Mac.
FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Glyphs - Make everything from dingbat webfonts to full-fledged text typefaces in the most Mac-like font...
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
FontLab VI - font creation and editing, including variable fonts and color fonts