Mongoose is a easy to use web server, it can be embedded into existing application to provide a web interface to it.
The web server executable is self-sufficient, it does not depend on anything to start serving requests. If it is copied to any directory and executed, it starts to serve that directory on port 8080 (so to access files, go to localhost:8080).
If some additional config is required - for example, different listening port or IP-based access control, then a mongoose.conf file with respective options (see example) can be created in the same directory where executable lives. This makes Mongoose perfect for all sorts of demos, quick tests, file sharing, and Web programming.

Mongoose Features:
1. Crossplatform
2. CGI, SSL, SSI, Digest (MD5) authorization, resumed download, aliases
3. IP-based ACL, Windows service, GET, POST, HEAD, PUT, DELETE methods
4. Small footprint
5. Embeddable with simple and clean API. Source is in single .c file to make things easy

The license of this software is Free, you can free download and free use this web server software.