FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
Pixel Pix - Turn your photos into pixel art
IrfanView - IrfanView ... one of the most popular viewers worldwide.
Voxel Builder - Design and edit 3D voxel models in your browser.
Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
Da Vinci Eye - Learn to draw by using your phone to overlay images for you to trace