EdScheme is a high-quality commercial implementation of the Scheme
programming language, once a staple of entry-level Computer Science
education. EdScheme was written by Schemers Inc. The manual was
written by Edward C. Martin and Iain Ferguson and published in 1993 by
Schemers Inc. (ISBN 0-9628745-6-6)

From the box:

Explore the art of programming with EdScheme!

EdScheme for the Macintosh is an incremental optimizing compiler for
the Scheme language designed specifically with the learner in mind,
but providing a complete implementation of the Scheme specification
for the intermediate and advanced user. The programming environment
takes advantage of the capabilities of the Macintosh computer, and
includes:

\- A full-featured integrated editor, with special capabilities such
as parenthesis-matching, program formatting, file indexing, and
template editing.

\- Customized transcript and debugging windows featuring colored and
styled text in addition to all the facilities provided by the
integrated editor.

\- A powerful and comprehensive turtle graphics interface, providing
users with access to the Macintosh's Color QuickDraw graphics toolbox
and many additional graphics capabilities.

At the same time, EdScheme is a powerful implementation, with:

\- Unlimited precision 'bignum' integral and rational arithmetic,
double-precision floating point arithmetic to approximately 16
significant digits, and complex number arithmetic

\- Comprehensive file-handling facilities, as well as access through
the Macintosh's serial ports to external devices such as the Hyperbot
robotic controller

\- Language extension using macros and transformers, support for
advanced programming techniques such as object-oriented programming,
delayed evaluation, and streams, and first-class continuations and
environments.

See other [Logo][1] and [turtle graphics][2] software:

 * [Turbo Turtle (1985)][3]
 * [Microsoft Logo (1986)][4]
 * [Object Logo Student Edition (1992)][5]
 * [Logo (1994)][6]
 * [HyperStudio 3.1 (1997)][7]
 * [MicroWorlds 2.0.5 (????)][8]
 * [UCB Logo (2003)][9]
 * [The Crystal Rain Forest 2000 (2003)][10]

Compatibility
Architecture: 68k

Requirements:
Mac Plus or newer
System 6.0.4 or better (Tested working on 8.6)
1 Megabyte RAM

  [1]: https://en.wikipedia.org/wiki/Logo_(programming_language)
  [2]: https://en.wikipedia.org/wiki/Turtle_graphics
  [3]: http://macintoshgarden.org/games/turbo-turtle
  [4]: http://macintoshgarden.org/apps/microsoft-logo
  [5]: http://macintoshgarden.org/apps/object-logo-student-edition
  [6]: http://macintoshgarden.org/games/logo-hypercard
  [7]: http://macintoshgarden.org/apps/hyperstudio-31
  [8]: http://macintoshgarden.org/apps/microworlds-205
  [9]: http://macintoshgarden.org/apps/ucb-logo-53
  [10]: http://macintoshgarden.org/games/the-crystal-rain-forest-2000