Yes; ISLisp was an international effort (EU + JP + some U.S. delegates) while EuLisp was purely European (France and UK.) Also, EuLisp is a more divergent dial

Yes; ISLisp was an international effort (EU + JP + some U.S. delegates) while EuLisp was purely European (France and UK.) Also, EuLisp is a more divergent dialect, and even more ambitious than common lisp; it had ML style modules, continuations via let/cc, generic LAMBDA (yes, first class anonymous methods!) full support for TCO and other goodies. EuLisp was an ideological successor to LeLisp (which was ancient and fugly) and I consider both the academic dabblings of one Christian Quinnec, Lisp designer extraordinaire.