MPTrac

MPTRAC is a Lagrangian particle dispersion model for the analysis of atmospheric transport processes in the free troposphere and stratosphere.

MPTRAC is an atmospheric model developed by researchers at FZ Jülich. 

The MPTRAC software may be redistributed and/or modified under the terms of the GNU General Public License v3.0.

More information and publications about MPTRAC in the research software directory.
If you want to get started, have a deeper look at GitHub.