OpenCola is an open source cola recipe that is freely available and modifiable by anyone under a GNU license. The recipe has gone through several versions since 2001 based on feedback and suggestions. At its peak, 150,000 cans of OpenCola were sold by a now-defunct company that originally created it to promote their open source software. Today's recipe is based on version 1.1.3 of OpenCola and can be made at home following the instructions.