At work we use load balancers from KEMP. They have an API which you can use to manage the load balancer, and I wanted a way of enabling and disabling real servers from my phone. Which would make it much easier to "drain" servers when you are on the go.
So I created a small webapp that I called DrainDroid using Phonegap and JQuery Mobile. I did not want to publish the load balancer API directly on the web so I also created a small PHP site that the client connects to over the internet and this PHP application has the access to the load balancer.
Here are two screenshots of the application:
I have uploaded the source code for DrainDroid on GitHub under the GPLv3 license.