LodePaint is a painting program aimed at pixel art, sprites, textures, photo editing, HDR image editing and computer graphics effects.

Features:

) Many tools and filters
) Easy navigation: arrow keys move cursor, zooming while using tools, etc...
) Focused on pixel editing, textures and sprites
) Create and edit High Dynamic Range images
) Easy editing of the alpha channel
Do filters on multiple images at once
) PNG, JPEG, GIF, TGA, BMP, RGBE, OpenEXR (on linux only), DNG import