上次推荐的都是开发组件，这次推荐几个成品项目。
MediaPortal
http://sourceforge.net/projects/mediaportal/
MediaPortal opens the portal to all your media. Listen, record and organize music, movies, radio, streams, pictures and even pause TV! Use internet sources to enrich your media with albumart or songnames. Enjoy your mediacenter or HTPC like never before!
SharpDevelop
http://sourceforge.net/projects/sharpdevelop/
SharpDevelop is an open source IDE for the .NET platform. It is entirely written in C#, and supports various project types in multiple programming languages.
Paint.Net
http://www.getpaint.net.nyud.net:8080/files/zip/pdn_src_2_72.zip
Paint.NET is image and photo manipulation software designed to be used on computers that run Windows XP or 2000. Paint.NET is jointly developed at Washington State University with additional help from Microsoft, and is meant to be a free replacement for the MS Paint software that comes with all Windows operating systems.
The programming language used to create Paint.NET is C#, with GDI+ extensions.
BugTracker.NET
http://sourceforge.net/projects/btnet/
A web-based bug tracker or issue tracker written using ASP.NET and C#. Requires SQL Server or MSDE. Easy to install and learn how to use, but there's power if you need it. Probably has all the features you want. Nice integration with email.
SubText
http://sourceforge.net/projects/subtext/
A tightly focused and usable blog publishing engine based on the popular .TEXT engine.
DotNetNuke
http://sourceforge.net/projects/dnn/
Open Source Web Application Framework for the Microsoft ASP.NET platform.