DotNetSSH is a pure .NET implementation of the SSH2 client protocol suite. DotNetSSH development is alive and active. DotNetSSH is a fork of Tamir's excellent SharpSSH, itself is a port of JCraft's java Jsch.
Log4net has moved to http://logging.apache.org/log4net.
The .NET implementation of the popular log4j Java API providing flexible and arbitrarily granular control over log management and configuration.
NLucene is the .NET implementation of the Lucene high-performance, full-featured text search engine written in Java. See http://jakarta.apache.org/lucene for more info on Lucene.