I think Control Tower is primarily meant to run local web services in situations where you don't want to depend on anything except Mac OS X and MacRuby. As you

I think Control Tower is primarily meant to run local web services in situations where you don't want to depend on anything except Mac OS X and MacRuby. As you can see it has no external dependencies and is the only web server –apart from WEBrick– which runs on MacRuby without compiling any additional code.