RockSim is a computer program that allows you to design any size rocket, and then simulate its flight to see how high, and how fast it will fly. Even before you start building your creation, you'll find out if it is stable and safe to launch.
United States
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OpenRocket Alternatives
OpenRocket is described as 'Free, fully featured model rocket simulator that allows you to design and simulate your rockets before actually building and flying them' and is an app in the education & reference category. There are 2 alternatives to OpenRocket for Windows, Linux, Wine and Mac. The best OpenRocket alternative is RockSim.
Alternatives list
SpaceCAD gives you the power to design and build reliable model rockets. You can assemble your rocket from a vast library of stock elements including nose cones, tubes, transitions, launch lugs, rings, and fins.
Germany
EU