csv2png and csv2jpeg use the GD library to plot time series data from a CSV file to either a PNG or a JPEG graphic. The program is deliberately simple, and is targeted at CGI applications. Originally written for RISC OS as csv2gif (see Acorn User, issue 215) the latest distribution builds on Linux as well.
cthumb allows you to create Web albums of digital pictures with thumbnails, captions, and several different views of the collection, including (optionally) several languages and resolutions. An album is composed of a series of pages, each composed of a collection of pictures. You can have several annotations per picture, and can customize almost everything in the way the albums look on the screen.
Cult3D is the new multi-platform 3D object rendering engine. It's a technological breakthrough that's 100% software. No additional hardware like 3D accelerator cards are required. As a desktop or notebook user you can now view 3D objects in realtime, a feature formerly found only on expensive workstations. And Cult3D gives all Internet users the opportunity to see high-quality 3D objects on-line on many platforms.
CYCAS is a 2D+3D CAD package for drafting and design in high quality and for creating 3D presentations and technical illustrations easily. Some of its features include an easy-to-handle user interface, special architectural elements and functions, a WYSIWYG display, printing, plotting, import and export filters, photorealistic rendering with POV-Ray, documentation and tutorials, example drawings, and an extendable 2D/3D symbols library.
DeuTex is a wad composer for Doom, Heretic, Hexen and Strife. It can be used to extract the lumps of a wad and save them as individual files. Conversely, it can also build a wad from separate files. When extracting a lump to a file, it does not just copy the raw data, it converts it to an appropriate format (such as PPM for graphics, .au for samples, etc.). When it reads files for inclusion in pwads, it does the necessary reciprocal conversions. In addition, DeuTex has functions such as merging wads, etc.