OpenFOAM is available from the OpenFOAM Foundation which licenses it free and open source under the General Public Licence.  The OpenFOAM downloads are produced and maintained by us — CFD Direct — on behalf of the Foundation, in two forms for Ubuntu, Other Linux, macOS and Windows:

Ubuntu Linux

Packaged version of OpenFOAM for Ubuntu Linux, with a simple installation using the Apt package manager.

Other Linux OS

Simple installation of the OpenFOAM package for Ubuntu on other distributions using the Docker container environment.

macOS

Simple installation of the OpenFOAM package for Ubuntu on macOS using the Docker container environment.

Windows

Installation options for Windows including running with Bash on Windows 10, a Virtual Machine and BlueCFD-Core

Download Archive

Older versions of OpenFOAM can be found in the download archive, with release notes available in the release history

CFD Direct From the Cloud

Alternatively avoid downloading and installing OpenFOAM by running CFD Direct From the Cloud