kexec-chooser is a thin wrapper around the kexec tool. It looks in /boot for available kernel images and associated ramdisk images, and will make the appropriate kexec call to load these into memory, and then create a stamp file. On a reboot (init level 6), if the stamp file exists, "kexec -e" will be called to execute the loaded kernel (a "warm reboot") instead of rebooting the machine.
splittar allows you to create one or more tar files from a set of data where each of the generated tar files is less than a specified maximum size. Each tar file is a proper, self-contained tar file. Other methods of backing up data to removable media requires a tar file to be split, making one of the tar file useless without the others. splittar was written to back up large amounts of data that span multiple DVDs while allowing for each DVD to be useful on its own.