This project has moved from https://compositec1.codeplex.com/ (September 29th 2015). You can still use the forums at CodePlex, but we encourage you submit issues here.
Visit http://docs.composite.net/Getting-started/Guide
Download binaries from https://github.com/Orckestra/C1-CMS/releases/latest
Head over to https://compositec1.codeplex.com/discussions to ask questions
Composite is the company driving the development of Composite C1. We are working full time on this CMS and on other cool stuff you can add to it. We are situated in Copenhagen and Kiev.
We are owned by Orckestra, a Montreal based company specializing in enterprise commerce software. They actively take part in the development as well.
You can visit us at http://www.composite.net and http://www.orckestra.com/