Bonanza Performance app
Complete Beechcraft Bonanza performance calculator for VFR and IFR.
Bonanza Performance is also available on IOS devices and as a WebApp (an App that runs in a browser) that runs on a variety of platforms (PC, Mac, tablets, phones). The cloud sync feature allows flight planning profiles entered on any device to be synchronized with your other devices when connected.
Bonanza Performance is a free, open-source development effort and has Apps and WebApps for other aircraft. See http://pohperformance.com for complete details.