Easy-ISLisp (EISL) is an interpreter and compiler compatible with the
ISLisp standard. EISL was written by Kenichi Sasagawa and is available
under a BSD license, featuring:
* Full support of the ISLisp standard plus a number of extensions.
* Readline support and syntax highlighting.
* A compiler with generates C code, comparable in performance as 
  equivalent code generated by SBCL.
* tail-call optimization.
* type inference.
* C interop,
* libraries for CSV handling, OpenGL, statistics, parallel execution,
  linear algebra, combinatorics, GNU Plot interop, lazy evaluation
  (delay / force, l*), Tcl/Tk interop, TCP sockets, Unicode support,
  prolog interpreter, etc.