If you're a software developer interested in running an open source project or just looking around for a particular tool to download, come check out the latest from CodePlex. CodePlex is Microsoft's open source project hosting site. Launched in May 2006, CodePlex host thousands of open source projects. CodePlex users can start open source projects with support for source control, bug tracking, wiki pages, downloads, forums, and project statistics. Additionally, CodePlex supports the widest range of source control clients. This talk explores the top downloaded projects, outlines the CodePlex feature set, and explains how we build the CodePlex software.