Old School Reference and Index Compilation is one of the most successful retro-clones that is no longer supported by Wizards of the Coast.
OSRIC, short for Old School Reference and Index Compilation, is a fantasy role-playing game system. 
 "OSRIC" is a recreation of the first edition of "Advanced Dungeons & Dragons", and one of the most successful retro-clones. 
"Dungeons & Dragons" retro-clones are fantasy role-playing games that seek to emulate editions of "Dungeons & Dragons" ("D&D") no longer supported by Wizards of the Coast. 
