ethstats is a script that quickly measures network device throughput. It works by parsing the /proc/net/dev file that the Linux kernel maintains, and thus utilizes a negligible amount of CPU time. ethstats shows the throughput of each device in both megabits per second and packets per second.
keyanalyze is designed to analyze keyrings in the OpenPGP format (PGP and GnuPG). It looks at properties of connectivity to generate strongly-connected set analysis, as well as some arbitrary statistics including a "mean shortest distance" calculation to show the most connected keys. This code is also used to create a report based on an extremely large keyset once per month.
An Eclipse plugin which provides a Vim-like input scheme for text editors.