Shoelacer attempts to generate a pair of small C functions that compress or decompress a set of data (primarily short strings) presented to it, and possibly other data of that kind. The data it is given may consist of entries of just a few bytes or longer. Its goal is to be reasonably fast with a tiny memory overhead. Compression performance is not so much the goal, although it certainly isn't ignored.
MultiLoad is a load balancer that redirects HTTP requests to pre-defined servers/locations. It gives the provider a way to balance the traffic and hides the real download location. It allows you to manage different version of each download. It is also a load balancing server extension. You can distribute files on some servers so that a downloaded file can be loaded form different servers. These servers can have different priorities to control the active traffic.
The GNU Tar Autoloader Patch allows you to automate tape loading (during writing) on any autoloader that supports changing to the next tape with the "mt offline" command. This only has an effect during backup. During restore, you will still have to manually change the tape because tar hops back and forth various times. It behaves exactly as upstream except during a write operation (using the "c" flag) with multiple tapes (using the "M" flag).
Nix is a purely functional package manager. It allows multiple versions of a package to be installed side-by-side, ensures that dependency specifications are complete, supports atomic upgrades and rollbacks, allows non-root users to install software, and has many other features. It is the basis of the NixOS Linux distribution, but it can be used equally well under other Unix systems.
PCDiskClone is a Linux-based bootable CD that allows cloning of computer hard drives to backup data or to migrate a system to another PC. It copies all data on the physical level with full support for IDE, SATA, SCSI, USB, and Firewire interfaces. It clones at a high speed of more than 7GB per miniute. PCDiskClone is specially programmed for external backup and computer replacement.