Dropzone Safety and Training: Safety and training advice for skydivers at all levels. Skydiving emergencies, student course material, and related articles.Parachute Jump Calculation: Freefall simulation, to determine the most likely trajectories of (groups of) skydivers with different fall rates. [Java]Parachutes Safely: Information on flying and landing high performance parachutes with safety in mind.Skydiving Safety Training: Website on skydiving safety training.Sport Parachutist's Safety Journal: Information about equipment, environments and human factors.