The Cooperative Software License (CSL) is a copy-far-left (as opposed to copyleft) license that aims to rectify some of the issues that arise when using a copyleft license such as the GPL, namely, that your work can still be used in some extent by commercial entities and other for-profit ventures. It is based on the Peer Production License, and is adapted to be more applicable to software.
I am not the author of the CSL. These pages are entirely unofficial. The CSL was created by raddle.me user jadedctrl. The official source for the CSL can be found here. This site simply exists to mirror its content, and to provided a formatted version of it.