Simple HTTPD

http://sourceforge.net/projects/shttpd/

http://code.google.com/p/mongoose/

SHTTPD is small, fast and easy to use web server. It supports CGI, SSL,
Digest Authorization. The unique feature of SHTTPD is the ability to
embed it into existing C/C++ applications. Embedded API is very clean    
and simple. SHTTPD has small memory footprint. Use it when other
web servers like Apache are too heavy for your tasks.