Ralpha Image Resizer - High-speed image batch conversion tool
DesignHill Image Resizer - Use designhill's free online optimized image resizer
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
ResizePixel - Free image editor to crop, resize, flip, rotate and convert images online
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
Crello - A simplified graphic design tool with 10,000 free templates.