XLISP

XLISP ( eXperimental LISP ) is a programming language that originated from a variant of the functional programming language LISP called Scheme in its modern version, and contains elements of object-oriented programming. XLISP belongs to the very high programming languages ​​and works with both object oriented and procedural.

In XLISP there is no distinction between programs and data, no declaration of data types, data structures of any size since the emergence of language Lisp possible in the 60s. The language is very clear, but not fault tolerant.

XLISP is developed by David Betz, 1983 publicly announced by him ( at that time still not Scheme - based), the source code of the interpreter is released as open source.