I recently had a need for an embedded web server. In the past, I've used a variety of libraries for this purpose (including building my own kind-of standards-compliant HTTP server - don't do this), but have always had my eye on the OWIN specification and related projects. Specifically, the Katana project from Microsoft looked interesting. Each previous time I investigated it, it looked like it was still pretty rough and needed a little more time. I was pleased to find what looked like a mature and easy to integrate library this time around though.