After many years of development and regular use, starting on January 2011, the PALM coupler has become Open Source with the name O-PALM. Every user is entitled to receive the full sources of the coupler, to use them and to modify them, accordingly to the LGPL v3 license, as stated in the header of every single source file. CERFACS will centralize the integration of the contributed development and will distribute the official releases. As stated in the license, the code comes with no guarantees. CERFACS offers user support, training and on site maintenance on the basis of specific agreements with the users.
http://www.cerfacs.fr/globc/PALM_WEB/EN/BECOMEAUSER/instructions.html