sentences:  Several developers have released the source code to many of their legacy titles, allowing them to be run as native applications on many alternative platforms, including Linux.Examples of games which were ported to Linux this way include "Duke Nukem 3D", "Shadow Warrior", "Rise of the Triad", "Ken's Labyrinth", "Seven Kingdoms", "Warzone 2100", "Homeworld", "Call to Power II", "Wolfenstein 3D", "Heretic", "", "Hexen II", "Aliens versus Predator", "Descent", "Descent II" and "Freespace 2".Several game titles that were previously released for Linux were also able to be expanded or updated because of the availability of game code, including "Doom", "Abuse", "Quake", "Quake II", "Quake III Arena" and "Jagged Alliance 2".