FF Multi Converter is a simple graphical application which enables you to convert audio, video, image and document files between all popular formats, using and combining other programs. It uses ffmpeg for audio/video files, unoconv for document files and ImageMagick for image file conversions.
A batch image converter and resizer
Converseen is an open source batch image converter and resizer for Linux and Windows. It supports more than 100 image formats and you can convert and resize an unlimited number of images to any of the most popular formats.
Join several jpg files into a single tiff multi image file
With it you are able to join several jpg image files into a single tiff multi image file.
It splits a tiff multi image file into individual jpeg image files
It is a little c sharp program that splits a tiff multi image file into separate jpeg image files.