Radical Image Optimization Tool or RIOT – free program designed for converting and optimizing graphic files.
Batch Image Editor Image Tuner 6.0 – free software to work with images. This program allows you to edit and change large amount of images and you can do so simultaneously.
Free Image Convert and Resize 2.1.43 – free program for converting, size changing and renaming batch of images simultaneously.
Light Image Resizer 4.7 – is a free graphic converter. With this program you can batch convert images.
PhotoScape – is a program that lets you to view graphics, edit images, convert RAW and run in batch mode.