Please download the latest version of LispPad. Older versions might not work properly anymore on the latest macOS release.

The source code of the Scheme interpreter and the included libraries has been published at GitHub. Example code and the sources of the included libraries can be found here. A specification of the R7RS standard of Scheme can be downloaded here.
Release 1.1.1 (2018-06-19)
Release 1.1.0 (2018-02-08)
Release 1.0.2 (2017-09-17)
Release 1.0.1 (2017-08-12)
Release 1.0 (2017-07-18)