1. 
   xlisp
   eXperimental LISP
   Found op http://foldoc.org/xlisp
   
   
2. 
   XLISP
   XLISP is a family of Lisp implementations written by David Betz. The first version was a Lisp with object-oriented extensions for computers with limited power. The second version (XLISP 2.0) moved toward Common Lisp, but was by no means a complete implementation. After a long period of inactivity, ...
   Found op http://en.wikipedia.org/wiki/XLISP
   
   
3. 
   xlisp
   1) Experimental lisp
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/xlisp/1
   
   

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