Ecopath with Ecosim
Ecopath with Ecosim 6.5.14040 is free to download from our software library. This free software was originally produced by Ecopath, Fisheries Centre, Univ. of British Columbia. The most popular versions among Ecopath with Ecosim users are 6.2, 6.1 and 6.0. The program lies within Education Tools, more precisely Science Tools. Commonly, this program's installer has the following filenames: Ecopath.exe and EwE6.exe etc.
From the developer:
Ecopath with Ecosim (EwE) is a free ecological/ecosystem modeling software suite.
You may want to check out more software, such as EcoSim Professional or EwE, which might be similar to Ecopath with Ecosim.