rtThumb Description:

WebThumb frees web designers from the tedium of thumbnail generation, frees disk space and makes image management easier. Take any JPEG image and convert it (on the server) to any size as it is sent to the user! Supports Microsoft Windows 9x, NT, 2000, and Red Hat 5.1.

WebThumb is great for web applications like product catalogs, photo albums and gallerys, member lists and more. WebThumb eliminates generating or uploading separate images for both preview and full size, simplifying both coding and maintenance.