OpendTect is an open source seismic interpretation software system for processing, visualizing and interpreting multi-volume seismic data, and for fast-track development of innovative interpretation tools.
OpendTect is released under a triple licensing scheme:
1) GPL (open source),
2) Commercial (allows access to the commercial plugins),
3) academic (free plugins for research only).
The GPL license covers OpendTect. The software is released with its source code (C++), is not protected by a license manager, and can be used by anyone, including for commercial purposes, as long as the user accepts to adhere to the GNU/GPL rules.