This app allows you to send arbitrary POST requests when you leave or enter a location, then notifies you when the request was successful/unsuccessful. You can set the radius of the location in metres.
Example: I leave my office, it sends a POST request to a server I run which turns on the lights.
Another one: I arrive at the office and it sends a POST request (with my name as a param) to my companies Check In system, and automatically checks me in for the day. Then when I leave the office it automatically checks me out.
You can run up to 20 different regions at a time.
If you have any questions/support queries you can hit me up on twitter: @nmdowse.