FEPX is distributed as a free / open-source software, under the terms of the GNU General Public License (GPL). In short, this means that everyone is free to use FEPX and to redistribute it on a free basis. FEPX is not in the public domain; it is copyrighted and there are restrictions on its distribution (see the license and the related FAQ).

It you use FEPX for your own work, please mention it explicitly and cite one the papers given on the Reference Papers page.

Current Official Release

The current official release (and previous ones) is available from the Releases section of the GitHub repository.

Latest Version

The latest version is available on the main branch of the GitHub repository. To get the latest version as a Git user, run:

$ git clone

which will download the repository. To update the repository at any later time, run:

$ git pull origin main

from within the repository.

To get the latest version as a non-Git user, run:

$ wget

which will download only the latest version. Alternatively, you may click on Code / Download ZIP on the GitHub repository.

The GitHub repository is also the place for interactions, see the Community page.