CommunityServer
CommunityServer, as the name suggests, is not for single blogs but for people who want to host many blogs with multiple authors. Along with blogging capability it allows forums and picture galleries also. As well as .NET it requires either the free Microsoft MSDE database for simple low traffic installations or SQL Server for heavy load. CommunityServer is free, has a commercial option and source is available. It’s the software behind blogs.msdn.com and the www.asp.net sites.
