Sather is an object oriented language designed to be simple,
efficient, safe, flexible and non-proprietary. One way of placing
it in the "space of languages" is to say that it aims to be as
efficient as C, C++, or Fortran, as elegant as and safer than
Eiffel, and support higher-order functions and iteration
abstraction as well as Common Lisp, CLU or Scheme.
Note: Sather has now been converted to the GPL/LGPL licence.