Welcome to ISLisp


Welcome to ISLisp

ISLisp is the ISO standard for Lisp languages and established in 1997. As an alternate solution to the defacto standard Common Lisp with huge language specification, ISLisp was developed to achieve a compact and consistent Lisp language to improve language processor efficiency and ease of learning and usage of the language, succeeding the fundamental concepts of Common Lisp and considering language features of EuLisp, Le Lisp and Scheme. In keeping with this objectives, ISLisp was developed on KL (Kernel Language) by Ito, Yuasa, Umemura and others as a basis for Lisp part and on ILOS, a subset of Common Lisp Object System CLOS, as a basis for object system.


This Web site is to encourage broad use of ISLisp by collecting and providing various information on ISLisp and software. This site also provides an ISO standard complient ISLisp processor, OKI ISLisp, as a free software.

What's New ?

July 7, 2011
Test data files in the ISLisp Verification System were updated.
September 23, 2010 
OKI ISLisp WIndows v0.80 release Notes was added.
September 11, 2010 
This Web site is open. OKI ISLisp had been released since 1998. But release was interrupted because of the shutdown of www.okilab.com. OKI ISlisp is released by this new site.