XnView is freeware software that allows you to view and convert graphic files. It's very fast and easy to use. But more importantly it supports more than 400 graphics formats!
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iResizer is an easy-to-use content aware image resizing tool with low requirements and high potential. iResizer enables new smart ways of resizing images without deforming or cropping the content.
Image Tuner is a free batch image resizing, renaming, conversion and watermarking software with a super-intuitive and straightforward interface.
Resize pictures, resize photos and resize images - compress, convert, and easily create copies of your pictures. Sort, rename or add a watermark to protect your pictures to be stolen.
Picasa is software that helps you instantly find, edit and share all the pictures on your PC. Picasa makes sure your pictures are always organized.