One clue is that a 404 page (e.g. http://color.com/asdf http://color.com/asdf) says the webserver is "powered by Jetty": http://jetty.codehaus.org/jetty/ http:/

One clue is that a 404 page (e.g. http://color.com/asdf http://color.com/asdf) says the webserver is "powered by Jetty": http://jetty.codehaus.org/jetty/ http://jetty.codehaus.org/jetty/ Jetty "provides an HTTP server, HTTP client, and javax.servlet container". Here is the wikipedia page for Java Servlet: http://en.wikipedia.org/wiki/Java_Servlet http://en.wikipedia.org/wiki/Java_Servlet So the answer seems to be Java.