High Quality Content by WIKIPEDIA articles! RedLightGreen was a database of bibliographic descriptions on the Web created by Research Libraries Group (RLG). RedLightGreen also allowed users to create citations for works found. On July 1, 2006, RLG was merged with OCLC, and it was announced that the RedLightGreen service would be replaced by WorldCat, via Open WorldCat, available at WorldCat.org.