Pygmy
Pygmy is a tiny webserver ment for embedding into applications. The core of the server around 40KB. It provides a flexible way to plug-in features, similiar to apache modules or servlets, but it's a much more lightweight API. However, pygmy isn't a replacement for servlet technology. Servlet containers can be integrated into pygmy, and replace other heavyweight http servers. Pygmy can scale it's functionality down to the bare neccessities. Features can be optionally added and removed to reduce pygmy's already small binary size. Pygmy tries to err on the side of simplicity, but allow for enough flexiblity so that it can be tightly integrated with applications.
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License
The Artistic License