SIOD

Features

• Implements the original version of Scheme from the Lambda Papers, but none of the modern language standards.
• Represents a very early use of conservative garbage collection in a Lisp interpreter, a method later copied by SCM and Guile.
• Compiling is implemented by emitting a fixed machine code prologue followed by a fast-loading binary representation of the parse tree to be interpreted.

  Applications

• GNU Image Manipulation Program – SIOD was its primary extension language, Script-Fu, until GIMP 2.4 was released.
• Siag Office – Scheme in a Grid is a spreadsheet application using SIOD as a base.
• Festival Speech Synthesis System – SIOD is its underlying command interpreter.