SimplePlanes

Create Airplanes - Build airplanes from scratch with a flexible, yet easy to use designer. Realistic Physics - Everything you build is realistically simulated. Realtime Damage - Parts can break off, but if you have the skills you can keep flying. Drag Model - Drag is calculated based on the actual geometry of your airplane. Sandbox Mode - Build what you want, fly where you want, play how you want. Source: The Developer Website.