Gentoo is a free operating system based on either Linux or FreeBSD that can be automatically optimized and customized for just about any application or need. Extreme configurability, performance and a top-notch user and developer community are all hallmarks of the Gentoo experience.
Thanks to a technology called Portage, Gentoo can become an ideal secure server, development workstation, professional desktop, gaming system, embedded solution or something else — whatever you need it to be. Because of its near-unlimited adaptability, we call Gentoo a metadistribution.
Of course, Gentoo is more than just the software it provides. It is a community built around a distribution which is driven by more than 300 developers and thousands of users. The distribution project provides the means for the users to enjoy Gentoo: documentation, infrastructure (mailinglists, site, forums …), release engineering, software porting, quality assurance, security followup, hardening and more.
Get if from http://www.gentoo.org/main/en/where.xml
The development project and its products are named after the fastest-swimming penguin, the Gentoo, to reflect the potential speed improvements of machine-specific optimization. Gentoo package management is designed to be modular, portable, easy to maintain, flexible, and optimized for the user’s machine. Gentoo describes itself as a meta-distribution, “because of its near-unlimited adaptability”, in that the majority of users have configurations and sets of installed programs which are unique to themselves