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.
Ch is an embeddable C/C++ interpreter for cross-platform scripting, shell programming, 2D/3D plotting, numerical computing, and embedded scripting. It is the simplest solution to numerical computing and visualization in the domain of C/C++. It supports the ISO 1990 C Standard (C90), major features in C99 (complex numbers, variable length arrays or VLAs, type generic functions, long long data type, etc), classes in C++, and extensions to the C language like nested functions, string types, etc. It can be embedded in other applications and hardware and used as a scripting language. C/C++ code is interpreted directly with no compilation to intermediate code. It supports Linux, Windows, MacOS X, Solaris, HP-UX, and FreeBSD.
iptotal is an *extremly* simple network monitor tool that measures the number of IP packages traveling to/from a specific network interface. It is based on a packet sniffer using libcap, so it does not require SNMP. Using Tobi Oetiker's rrdtool it can create 2hr, daily, weekly, monthly and yearly graphs. It maintains an archive of the last 30 daily graphs. It was specifically written for a FREESCO router (http://www.freesco.org) but can be ported to other Linux distros.
TVEz is a browser-based system to manage movies, shows, and clips stored on local or remote file systems. It is also a front end to the XINE video player that makes the control of the player possible from the Web browser. It retrieves information about movies, including an image of the cover, from IMDB, and stores that information in a MySQL database. The database entries are fully searchable by director, writers, actors, titles, etc. It includes a rating system for movies by which movies can be sorted such that your most favorite ones appear on top of the list. The Web-based configuration is generic enough so that any kind of show can easily be added to the shows listing. The playlist is fully manageable.