Common Lisp Quick Reference is a booklet with short descriptions of the thousand or so symbols defined in the ANSI standard. It comes with a comprehensive index. It is written in LaTeX and formatted for printing on both A4 and letter paper. After folding the sheets lengthwise, they can easily be turned into a handy booklet.
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.
The X3D library is used to load an X3D file and render it using OpenGL (an X3D file is an XML file describing a 3D environment that can be rendered with OpenGL.) The library supports all the objects as defined in the X3D specification in 2006. The render library is still somewhat limited, though. It works well under Linux. It is likely to work on any Unix, and has worked under MS Windows before. The project includes a test that makes use of FLTK version 2.0-m3. That version of FLTK can be downloaded from the project repository, as FLTK itself actually ended up not publishing a concrete 2.0 version of the library.
IPTables-tutorial is a tutorial which explains how to install and set up iptables and netfilters on Linux. It takes you through a usable example file step by step, and helps you understand its basic functionality. The tutorial currently contains 6 different example scripts that may be used freely under GPL licensing terms.