POH Performance, LLC is dedicated to free, no advertising, and open source aircraft performance calculator Apps. The Apps capture POH information in a dynamic and easy to use form that is useful both pre-flight and in-flight.
The source code for POH Performance apps is published on Sourceforge. This fosters a community of developers to provide enhanced features and additional aircraft types and models. If you're interested please see the Developers page.
The long term goal of this project is to explore what a 21st-century POH might look like.