What is a good App for OSX that locks your Macbook when outside "known" wifi area I am looking for an app that locks my Macbook when not connected to a known wifi network. And I am the only one who can manage my known networks: I'm asked for a password to add networks to my "known list".

Who knows a good app for that?
You can use ControlPlane where you can set up rules based on various criteria.


  ControlPlane supports multiple contexts where a context is defined as a location or activity you are performing.  Using evidence sources you can create a set of rules that tell ControlPlane what context to apply to your environment.  When ControlPlane enters or leaves a context a set of Actions are performed.