Java Image Viewer And Manipulator
easy to use image editor for OSX
Unofficial Windows builds of FontForge
Image Converter - Back2d
Cross Platform GUI Toolkit
An enhanced Go experience for the Atom editor
Paint Program
A batch pipelined image editor
Tag FLAC ,Vorbis, Lyrics, WMA, Wavpack, ID3 Tags in a Smarter Way.
Nik plugins on Ubuntu standalone or with Picasa3
pgf/TikZ diagram editor
Free yourself
Advanced image processing toolbox for Scilab on Unix/Linux/Mac OS
GIMP (GNU Image Manipulation Program) is a free image editor
A full featured cross-platform image library
Professional quality open source illustration software
Convert images to Ascii Art, with a lot of options and drawing tools
Photo alignment and superimposition software
ANSI Text Editor like PabloDraw for Windows
A graphical Finite State Machine (FSM) designer.