DSWIM is a powerful informational tool for Debian's packaging system. Designed with an integrated approach it combines the functionality found in several other programs and scripts. This provides users with a centralized approach for querying the installation, allowing programmers the liberty of writing smaller and simpler code.
The tcshrc package provides a well-organised set of configuration files that make full use of the advanced and often unknown features of the tcsh shell. Features used are a comprehensive prompt setting, advanced "set"s and "alias"es, bindkey support for the function keys, and intelligent completion. A Makefile is included for a safe installation procedure.
x10ephem computes sunrise and sunset times. It consists of a library and an assortment of utilities. The most useful utility is x10events, which parses crontab files and updates the time fields to track sun events. Combined with an X10 interface like HEYU or X10, this allows the scheduling of lighting events to follow the changing seasons and daylight savings time automatically. This application does not depend on X10; it can be used for any crontab entry you like.
bashlib is a shell script that makes CGI programming in bash easier, or at least more tolerable. It contains a few functions that get called automatically to parse incoming form parameters, keywords, and cookies, and builtin functions to access this data. It is very well documented and can be extended very easily.