This team maintains a Launchpad PPA for the Delta3D package.

http://www.delta3d.org

The developers of Delta3D are not responsible for maintenance of Delta3D on Launchpad, nor is the maintenance team responsible for the Delta3D code. Please, feel free to report bugs on the Delta3D forums: http://www.delta3d.org/forum/index.php

Delta3D is a widely used and well-supported open source game and simulation engine. Delta3D is a fully-featured game engine appropriate for a wide variety of uses including training, education, visualization, and entertainment. Delta3D is unique because it offers features specifically suited to the Modeling and Simulation and DoD communities such as High Level Architecture (HLA), After Action Review (AAR), large scale terrain support, and SCORM Learning Management System (LMS) integration.

Delta3D is released under the GNU Lesser General Public License (LGPL). The underlying modules may have their own licensing, but are at the minimum, considered Open Source and are freely distributable. The STAGE source code which uses QT is licensed under the GNU General Public License (GPL). All modifications and contributions to the editor are considered to fall under the same license.