Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
GIMP - GIMP is a multiplatform photo manipulation tool.
Glyphs - Make everything from dingbat webfonts to full-fledged text typefaces in the most Mac-like font...
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
FontCreator - This professional font editor allows you to create and edit TrueType and OpenType fonts.