There was a download of EwE 6.0 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. This free tool was originally designed by UBC Fisheries Centre. The software is included in Education Tools. We recommend checking the downloaded files with any free antivirus. The following versions: 6.1 and 6.0 are the most frequently downloaded ones by the program users.
From the developer:
EwE is an ecological modeling software suite for personal computers that has built and extended on for almost twenty years.
EwE has three main components: Ecopath – a static, mass-balanced snapshot of the system; Ecosim – a time dynamic simulation module for policy exploration; and Ecospace – a spatial and temporal dynamic module primarily designed for exploring impact and placement of protected areas.
You may want to check out more software, such as Easy Web Extract, Ecopath with Ecosim or Garritan World Instruments, which might be similar to EwE.