ObjectLOGO
A variant of LOGO with object-oriented extensions. Lexical scope. Version 2.6, for the Mac. Paradigm Software <paradigm@applelink.apple.com> (617)576-7675.
MegaLexica
A variant of LOGO with object-oriented extensions. Lexical scope. Version 2.6, for the Mac. Paradigm Software <paradigm@applelink.apple.com> (617)576-7675.