OPCAT InstallationOPCAT is a desktop standalone software for OPM-based modeling.
It is provided freely as-is with no support or guarantee whatsoever.
OPCloud is a modern cloud-based software that can be used freely by academic professors for teaching and research purposes only upon request to opcloud@technion.ac.il
For Java download follow Java SE Runtime Environment link
OPCAT is free under GNU General Public License – http://www.gnu.org/licenses/gpl-3.0.en.html and gratis (no fee required), but without commitment to provide access to the source code.