httplib defines a webserver (httplib.Server) which is build on top of the .NET/Mono System.Net.HttpListener. It supports 'out-of-the-box' fileserving, and fairly complex processing of user requests/URLs. It's highly configurable (using YAML), and easy to extend—new modules and renderers can be loaded at runtime.
The code is written in Nemerle and compiles and runs on Windows and Linux platforms. The built assemblies (httplib.dll et al) should be usable by any .NET/Mono language.
See the myserver/ or forum/ sub-projects for examples of how to use the server. Please also have a look at the notes for information on setting up a (MySql) database connection or configuring your platform to support SSL/https serving.