OpenRocket

OpenRocket is full-fledged, cross-platform model rocket design and simulation software. Features include six-degree-of-freedom flight simulation, automatic design optimization, real-time simulated altitude, velocity, and acceleration display, staging and clustering support, and cross-platform (Java-based). It includes real-time view of CG and CP position. Information from a continuous simulation performed in the background and zoomable schematic view of rocket from the side or rear, with rotation around the center axis.

What is new in this release:

Version 12.09.1 has added new feature is the option to automatically open the latest design file on startup.