Recently, I've been thinking a lot about model rocketry. I tried to search around for some FREE (hint, hint) software to simulate my designs, and found OpenRocket (http://openrocket.sourceforge.net/). Elated, I clicked on the download link, but I saw that the program was in a .jar format. To open a .jar file, I need Java, but can't install it because of the requirement of an admin password.
Other reccomendations?