FreeImage is a library project for developers who would like to support popular graphics image formats (PNG, JPEG, TIFF, BMP and others). Some highlights are: extremely simple in use, not limited to the local PC (unique FreeImageIO) and Plugin driven!
PhoXo Core Library (PCL) is a set of powerful image manipulation library for C++, it's OS independent and highlights are : Undo/Redo,multiple-layer,region selection,tens of image effect...
AnyWikiDraw is a graphical editor for rapid editing of drawings and diagrams on Wiki pages. Supported file formats: SVG, PNG, JPEG and DRAW. Supported Wikis: MediaWiki, PmWiki and TWiki.
Java Open Framework (JOF) is a suite of applications extending your creative potential. JOF includes a HTML creator, image editor, text editor and an audio/visual player and converter.
TMPCanvas is a set of Delphi's Components and Controls which implement a vector Canvas and some basic GIS tools.