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.
The Linux-Ecology-HOWTO discusses ways to make computers less harmful to our environment and to solve some ecological issues. It explains how to use Linux to save power and consumables like paper and ink. Since it does not require big hardware, Linux may be used with old computers to make their life cycle longer. Games may be used in environmental education and software is available to simulate ecological processes.
MP3c is a curses-based audio CD-to-MP3/OGG converter with CDDB support. It can be used in an interactive menu environment or a batch mode which lets you encode automatically. MP3c tries to find the most useful information in a CDDB entry, and even recognizes sampler CDs correctly. It is very configurable and can be used with every available encoder, ripper, and tag editor. It is available in different languages (currently English, Spanish, Portuguese, Italian, Polish, and German).
The Linux-Mobile-Guide (formerly called the Laptop-HOWTO) is a guide covering laptop, notebook, PDA, and mobile phone related Linux features, such as installation methods (via network interface, without CD/DVD drive, etc.), hardware features (PCMCIA, IrDA, Bluetooth, APM, ACPI, etc.), and configurations for different environments.
Ftwalk is a high level script programming language, very similar to awk, but greatly extended to include a richer type system, object-oriented features, 300+ built-in functions, extensibility through dynamic libraries, etc., which makes it roughly comparable to languages like Perl. It does file tree searches, and was originally used to implement selective redundant copy backup stores. It can be run interactively as a calculator.