gSplit is a tool that allows you to split and assemble any files you want. It can be used to split big files to be able to store them on different devices. After assembling the different parts of a file, you can then check the file integrity to determine whether everything is now ready to use.
geh is a simple command line image viewer with various nice features. It currently supports a slide-show mode displaying multiple images in a row either controlled by a time interval and/or mouse button clicks, and a thumbnail mode creating small thumbnail images and caching them in ~/.thumbnails according to freedesktop.org's thumbnail specification.
neko-install-cd is a development tool for modifying System Rescue CD images. It can also perform many other operations. It has a simple interface with excellent inline help. Operations it can perform include: booting your modified image in a virtual machine, burning the original or modified image to a USB drive, creating patch sets from your modifications (using aufs or built-in helper scripts). All of these operations can be performed directly from your Linux distribution, without having to first boot into the system rescue CD as with the system rescue CD equivalents.