Scheme
Contents
Standards
R7RS
Specifications:
Revised 7th Report on the Algorithmic Language Scheme:
Links:
R6RS
Specifications:
Revised 6th Report on the Algorithmic Language Scheme -- Language Report:
Revised 6th Report on the Algorithmic Language Scheme -- Standard Libraries:
Revised 6th Report on the Algorithmic Language Scheme -- Non-Normative Appendices:
Revised 6th Report on the Algorithmic Language Scheme -- Rationale:
Links:
R5RS
Specifications:
Revised 5th Report on the Algorithmic Language Scheme:
Links:
RnRS
Specifications:
SRFI
Links:
References
Although there are countless references on the subject of Scheme, or Lisp in general, bellow you find a short list of those I find the most useful.
Books
HTDP -- How to Design Programs (available on-line);
SICP -- Structure and Interpretation of Computer Programs (available on-line);
Tutorials
Links
Implementations
This is an extremely short list of available Scheme implementations (environments, libraries, etc.). It mainly contains those that I have used, or those I am interested in.
(Because Scheme is such a simple language practically anyone can cook-up an implementation in a matter of hours --- I know, because I did one once.)