Having some free time during the Christmas break, I decided to give a shot at a small project that I had in mind for a while, and that was to develop a PSGI-compliant(-ish) web server with support for the SPDY protocol.
kazeburo created a nice little gist to run Nagios with Plack and a few modules. Nagios is known to have a lot of dependencies to run, such as PHP, CGI-capable http server and static web server, all of which can now be done in a single Plack-based daemon.