Numitras aims to be a flexible tool to plan and analyse space missions. Although an easy usage is a primary target Numitras provides a good precision. This is accomplished by the flexible plugin system that allows you to implement some parts on your own if you want to increase Numitras' accuracy.
I was inspired to this project by Orbiter, a freeware space simulator made by Martin Schweiger.
While Numitras may not yet be ready for use with that simulator (mainly because of its inability to import Orbiter scenario coordinates) it can be used for simple demonstrations, for example a Low Earth Orbit (LEO) or a a flight to the moon.
The download on this page comes with several sample configurations and body systems as demonstrated in the Quick Start tutorial (see flash window).
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 Germany License.
Major features include:
These screenshots were taken during the development of the current version (7 June 2009):
Numitras provides a very flexible plugin system that allows you to add custom implementations for integrators, orbits, maneuvers and forces. To do this you just have to extend the corresponding base classes. To find out how to implement plugins on your own you should have a look at the source code of the exisiting standard plugins.
The source code is available as a Zip archive. Pay attention to the Creative Commons License mentioned in the Downloads section!
There are some features that would hugely improve Numitras' accuracy but I'm not going to continue development in the next few months. But maybe you want to try and implement them yourself:
If have any questions about the source code or the mathematical background of this just use the contact form.