Codeplex is my favorite site. CodePlex is Microsoft’s free open source project hosting site. You can create projects to share with the world, collaborate with others on their projects, and download open source software. It is a great place to find so many open source project available to explore. All the software are the free and open source. I often go there at intervals to check what is new in SQL Server field as well on other technologies. Yesterday when I visited it, I had a nice surprise as it has a total makeover and looks very decent as well elegant at the same time.