Absolute is a x86 Linux distribution based upon Slackware. It concentrates on "desktop" use so that it is ready for internet, multimedia, document and general home use out of the box. Absolute is lightweight -- meaning 2 things: that it can run on on older hardware and that the OS interface stays out of your way.
It is version-compatible with Slackware so you can use almost any package from the same version of Slack on Absolute. Development libraries (headers) for everything installed are always included, so you can code and/or build almost anything from source.