Online Image Editor - Online editor for images and animated gifs with multiple effects and tools
SVGO - Tool for optimizing SVG files
Pixelitor - Pixelitor is a cross-platform raster graphics editor written in Java.
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Scour - SVG Optimizer / Cleaner