mylbhelper helps dumb load balancers do their job. It monitors a local MySQL instance by periodically issuing a query. Should the query fail, a custom script, which typically would firewall off the load balancer, is executed. Likewise, when it comes back up, another script is executed. This means you can use any load balancer capable of distributing TCP traffic rather than one natively capable of talking MySQL. mylbhelper can also act solely as a monitoring daemon.
darcspublish is a shell script that allows you to easily share your Darcs repository between different computers, give read access to the world, or publish a Web site that is backed by a Darcs repository on your computer. It should work with any Bourne shell, and only needs Darcs and sitecopy to work.
dpkg-du is a script to produce a dump of the installed size of Debian packages in du format. This is to enable ease of reuse with pre-existing scripts administrators may have to deal with 'du' format lists. For example, dpkg-du|sort -n|tail -10 will show the 10 biggest packages on your system.
CODEX (the Cornell Data Exchange) is a key distribution system. It is designed for applications with a moderate number of clients (tens or hundreds) requesting keys that change often but not continuously (on the scale of minutes to hours). It employs the RSA and ElGamal encryption schemes, as well as techniques such as threshold cryptography and proactive secret sharing.
MAC vendor check is a script that gathers MAC addresses in a network and creates a list of the vendor of each device. It can be use to quickly check whether strange devices are present on the network, especially if there is no dedicated management software (like Cisco Works) in use on the network.