What is the best Scheme implementation for working through SICP?

Question

I have been using PLT Scheme, but it has some issues. Does anyone know of a better implementation for working through SICP?

Answer 1

Use Racket (formerly PLT Scheme).

The DrRacket IDE is an excellent starting point for all things Scheme including SICP.

To look up keywords in the documentation, place the cursor on the keyword and press F1. In DrRacket you can now see the images directly in the REPL (the read-eval-print-loop).

SICP Support for DrRacket, by Neil van Dyke.

Update (2016): The new SICP package is at http://pkgs.racket-lang.org/#[sicp] Download it with the Package Manager (in DrRacket) or use raco. Manual

Update2 (2016): Also if you want to try a new implementation of the SICP picture language, then download sicp-pict2.rkt.

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Update3 (2020): The sicp-lang package includes an implementation of the sicp language and the sicp picture language.

Documentation: SICP Support for DrRacket
Source Code: sicp-lang on GitHub
Racket Package: sicp-lang package info

Note: The picture language has more features (such as colors and larger sizes) than the picture language described in the book. The source contains examples: https://github.com/sicp-lang/sicp/blob/master/sicp-pict/main.rkt