🚀 go-pugleaf

Here are some more languages (from computer algebra).
Each has had hundreds if not thousands of users.

Scratchpad            a general-purpose language originally written
		      for computer algebra at IBM Research in the
		      1980s.  It features abstract parametrized datatypes, 
		      multiple inheritance and polymorphism.  Implementations
		      exist under VM/CMS and AIX. Authors include
		      Richard Jenks, Barry Trager, Stephen M. Watt and
		      Robert S. Sutor.

Maple                 the interpreted language for the Maple computer
		      algebra system developed at the University of
		      Waterloo (Canada) in the 1980s. Authors include
		      Gaston Gonnet, Keith Geddes, Stephen M. Watt and
		      Michael Monogan.

Mathematica           the interpreted language for the Mathematica
		      computer algebra system developed by Wolfram
		      Research in the late 1980s.

Macsyma               the language for the Macsyma computer algebra
		      system developed at MIT, Symbolics and others
		      in the 1970s and 1980s.
-- 
                                Robert S. Sutor
Department of Mathematics                       Mathematical Sciences Department
Princeton University                            IBM T.J. Watson Research Center                
rssutor@math.princeton.edu                      sutor@yktvmz, sutor@ibm.com

--
                                Robert S. Sutor
Department of Mathematics                       Mathematical Sciences Department
Princeton University                            IBM T.J. Watson Research Center                
rssutor@math.princeton.edu                      sutor@yktvmz, sutor@ibm.com