Gambit, also called Gambit-C, is a free software Scheme implementation, consisting of a Scheme interpreter, and a compiler which compiles Scheme to C. Its documentation claims conformance to the R4RS, R5RS, and IEEE standards, as well as several SRFIs. Gambit was first released 1988, and Gambit-C (that is, Gambit with the C backend) was first released 1994.