License info:
OpenTyrian, Ur-Quan Masters, OpenTTD, Commander Genius, GemRB, UFO: Alien Invasion, VCMI, MilkyTracker, GrafX2, SuperTux,
Alien Blaster, Jooleem, Pachi el marciano, OpenArena, and Ubuntu noroot are licensed under
GNU General Public License.
TeeWorlds is licensed under
BSD-like license.
Free Heroes 2 is licensed in part under GPL, in part under
non-commercial license.
The game content (graphics, sounds, music, levels, dialogue, demo game data etc) of
Ur-Quan Masters,
Free Heroes 2,
Commander Genius,
and
GemRB
is licensed under various free-distribution non-commercial licenses.
The game content of
OpenTyrian is freeware.
OpenTTD does not contain any content from the Transport Tycoon Deluxe game, it's game content is created independently and licensed under GPL.