ocAds (Open Classified Ads) is a PHP script to build your own classifieds site. It enables you to create classifieds sites in minutes, and comes with thousands of car, boat, motorcycle, ATV, RV, and trailer classifieds. It is fully customizable regarding listings and display, and features SEO friendly URLs, templates, and more.
Cross Linux From Scratch (CLFS) is a project that provides you with step-by-step instructions for building your own customized Linux system entirely from source. This is a multi-architecture version of Linux From Scratch that is cross-compiled. It currently supports Alpha, MIPS, PowerPC, Sparc, x86, and x86_64.