C182 Performance computes all the useful performance numbers for flight planning for most Cessna 182 aircraft models and some Cessna 210 models. It includes calculations for takeoff, landing, climb, cruise, descent, instrument procedures as well as emergencies. It also includes an interactive hold calculator, a risk analysis tool, and an emergency glide distance calculator that handles head and tailwinds.
C182 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.
C182 Performance is a free, published-source development effort and has Apps and WebApps for other aircraft. See http://pohperformance.com for complete details.