KernelControl is a free app on XDA with a upcomming next version in the Play Store for a few bucks (a donate version if you want so).
Download On XDA: Thread
If you want to develope your own plugin have a look at the getting started page.
If you still experience problems with the API, message me at xda or use the contact options in the KernelControl app. I'll try to answer as fast as I can ;).