SAGA is a Free Open Source Software (FOSS), which generally means that you have the freedom
Except for the SAGA Application Programming Interface (API) most SAGA source codes have been licenced under the GNU General Public Licence or GPL. The GPL requires derived works to be available under the same or a comparable licence, with other words derived works have to become Open Source as well. For a few reasons the SAGA creators decided to use a less restrictive licence for the SAGA API. The API uses the GNU Lesser General Public Licence or LGPL, which permits use of this library in proprietary programs, i.e. SAGA modules, which always base on the API, have not automatically to be published as Open Source too.
The SAGA development started with the beginning of the 3rd millenium and has been initiated by a small team of researchers from the Dept. of Physical Geography, Göttingen. In 2007 the center of the SAGA development moved towards Hamburg, where a few of us are employed now at the Dept. of Physical Geography, Hamburg. Find out more in the Development section of this web site.