Log4net
Log4net is a very famous open source component for log logs based on. NET development. He was first launched in July 2001 by Neoworks Limited, the basic framework derived from another very famous sister component-log4j. Log4net logging is very powerful. It can be divided into different levels of the log, than the different styles, the log output to different media.
Http://hi.baidu.com/vivifish/blog/item/acd18e351f3cf31591ef39fd.html
Atlas (Microsoft's AJAX solution)
ASP.net's Atlas feature is not just another AJAX script library for writing client-centric WEB applications. Atlas builds on the. NET Framework 2.0 constructs and adds support capabilities to better utilize client javascrīpt and XMLHttpRequest objects. It includes server-based features that make it easier to enrich existing asp.net applications, and the client script libraries used by the Atlas controls and services. The architecture diagram in Figure 1 shows that the Atlas architecture spans clients and servers and should be seen as a broad set of development technologies for creating richer, more responsive, cross-browser Web applications.
Http://www.microsoft.com/china/msdn/library/webservices/asp.net/Atlas.mspx?mfr=true
Power collections
Http://www.infoq.com/cn/news/2007/09/PowerCollections
NHibernate
Http://www.cnblogs.com/wxx/archive/2005/07/17/194337.html
