The Lisp Machines were easily the best environments ever created for developing in Lisp, but the companies that produced them died out quite a while ago (Dan Weinreb has described some of the reasons for this).

Patrick Collison » blog

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dsb: A lite version of Common Lisp destructuring-bind for Arc. By Kenny Tilton.

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#lisp.py
#
#An interpreter for a simple scheme like lexically
#scoped language implemented as single python expression.
#
#The interpreter is limited to the lambda special form and a
#sum function. The data types supported are positive integers
#and symbols.
#

Programming in python: Lisp in a single expression

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CDR 5: Extra Numerical Types for Common Lisp, Extra Numerical Types for Common Lisp

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