GUI service manager for OS X? I am looking for a GUI application, with in icon on the top bar, that can be used to start and stop different services on OS X.

These do not have to be real OS X (launchd) services/daemons, it is enough for me to be able to define them, with a name, a start and a stop script.

Mainly I want to use it for development to manage things like tomcat, nginx, postgresql... which are not usually started.
I'd rather have this a comment, but for some reason I can only post answers.

Have a look at LaunchControl: http://www.soma-zone.com/LaunchControl/. While it does not offer a menu item to start/stop services it provides a list of all available launchd jobs, their current status and a way to start/stop them with the click of a button.

EDIT

LaunchControl now does offer a menu item for controlling selected jobs: