Chicken Scheme
Chicken Scheme is an R5RS compliant compiler for the Scheme programming language. It produces C code as output.
Chicken Scheme is an implementation of Scheme.
Other implementations of Scheme.
Chicken Scheme is an example of a compiler. You may find the programming tasks that have been solved using it here.
Chicken Scheme is implemented in C, using Henry Baker's "Cheney on the MTA" algorithm which uses the C stack pointer as it's garbage collection allocation pointer.
Chicken Scheme uses libraries called eggs as well as SRFIs.