Nokia released the S60 web browser under open source last week. Nokia just told me that they now also released a Symbian port of the Apache web server under open source.

Running an Apache web server on your Nokia phone is a cool thought. There could be many applications for this. Besides the http server, Nokia also released a gateway solution that actually makes it possible to address a mobile phone via a URL. Nokia also ported Phyton to Symbian S60.
More details and source code available on this site.