You can make a simple MSN control (which users can login), web authentication gateway (Horatio based), load balance (iproute2), traffic shape (QoS), simple packet filter and NAT redirects (DNAT), loadbalance and VPN gateway or roadwarrior and ...
dpkglist.awk is a command-line tool for querying available packages on ubuntu and debian systems. It overlaps with the standard apt-cache utility, but, written in simple awk, it is easily extensible, and makes it easy to write one-line scripts.
LIME (Less-is-More) is parallel/concurrent programming environment based on C. Internally, it uses XML technology to describe tasks and their dependencies. Externally, it offers the ANSI C99 programming as well as a set of visually-oriented interfaces.