Leadwerks Texture Tool is a free utility for viewing and editing textures.
-Load and save .bmp, .jpg, .png, .tga, and .dds (uncompressed, DXTC1, 3, & 5) images.
-Convert heightmaps to dot3 normal maps.
-Scale dot3 normal maps.
-Flip dot3 normals horizontally and vertically.
-Load, save, and view alpha channels.
-Copy images to the Windows clipboard, including the alpha channel.
http://www.leadwerks.com/ccount/click.php?id=60
-Load and save .bmp, .jpg, .png, .tga, and .dds (uncompressed, DXTC1, 3, & 5) images.
-Convert heightmaps to dot3 normal maps.
-Scale dot3 normal maps.
-Flip dot3 normals horizontally and vertically.
-Load, save, and view alpha channels.
-Copy images to the Windows clipboard, including the alpha channel.
http://www.leadwerks.com/ccount/click.php?id=60