cgi-util is a fast, easy to use C library for creating CGI programs. Functions are available for initialization (parsing), grabbing fields (by string, integer, double or boolean value), embedding HTML files, and more. It accepts both POST and GET request methods and has extensive error handling.
CGIWrap is a setuid wrapper that allows users to install and execute their own cgi scripts that get executed as their own userid. Much of the idea of suexec came from CGIWrap, however, cgiwrap stands on its own, and works with all web servers. CGIWrap must be installed by a system administrator, but after that, users can do their own web scripting.
Euphoria is a simple, flexible, easy-to-learn programming language. It lets you quickly and easily develop programs for Windows, Linux, FreeBSD, NetbSD, OpenBSD, and Mac OS X. Although Euphoria provides subscript checking, uninitialized variable checking, and numerous other run-time checks, it is extremely fast and has the ability to compile to transparently compile native executables via C code.
Ilib is an image manipulation library for developers. It's capable of reading and writing images (PPM/PGM, PNG, JPEG, GIF, XPM, BMP) and many drawing functions including drawing lines and text using any BDF (X11) font. It's great for generating GIFs/PNGs from a CGI or generating graphs. Ilib includes sample applications for generating graphs for HTTP access.log files and QuakeWorld server frag log files and a tool for creating image indices from a group of images.
ModiWrap is a scriptable, configurable, paranoid setuid wrapper for CGI and other Web scripts (such as PHP). It aims at full compliance with the CGI specifications. It allows users to run their own CGI/webscripts with their own UID while minimizing the risk of compromising the host system. All resource limits and running time alarms can be configured on the fly on a per-user basis with an optional limits daemon. It can be made fully compatible with suexec, cgiwrap, and mod_php. It should be compatible with any Web server.
PLOTICUS is a command line utility for creating bar, line, pie, boxplot, scatterplot, sweep, heatmap, vector, timeline, Venn diagrams, and other types of charts and plots. ploticus is good for automated or just-in-time graph generation. It handles date, time, and categorical data nicely, and has some basic statistical capabilities. It can output to GIF, PNG, SVG, SWF, JPEG, PostScript, EPS, and X11. You can use convenient preset options or create complex scripts with rich and detailed color and style operations.