Retro-clone Systems
A number of fans and publishers have created copies of rules systems which are no longer supported, and released those rules systems under an open license. The term "retro-clone" was coined by Goblinoid Games, the publisher of Labyrinth Lord and GORE.
The best known example of a retro-clone game is OSRIC, which contains the rules for 1st edition Advanced Dungeons & Dragons. Other examples are GORE (the Basic Roleplaying System i.e., the rules used in RuneQuest and Call of Cthulhu), Labyrinth Lord (based on Basic Dungeons & Dragons), Swords & Wizardry (based on Dungeons & Dragons c. 1974), and Dark Dungeons (based on Dungeons & Dragons Rules Cyclopedia).
Read more about this topic: Open Gaming
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