Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.
Ralpha Image Resizer - High-speed image batch conversion tool
GIMP - GIMP is a multiplatform photo manipulation tool.
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.