RDF/OWL/SPARQL/Triple Stores/Reasoners and other Semantic Web APIs for C#?

Question

For those of you working on Semantic Web development, which C# tools do you use for reasoning, parsing, etc.? The idea is to build a central repository of all C# APIs currently available. Sort of like I did here. Please post links, if you can, so I am able to summarize correctly.

Answer 1

A nearly comprehensive list of .net (c# or whatever) semantic web tools could be found at W3C SemanticWebTools page or AI3 swtools list

Answer 2

You could try my Library dotNetRDF - it is free and open source and provides a state of the spec SPARQL implementation including almost all current draft SPARQL 1.1 features

Answer 3

I found RDFSharp at Codeplex and, for me, it seems promising, with nice ideas and a user-friendly API. It is very young, so it can only mature with the time.