Came here to plug the GT.M version of MUMPS, which is really great. It uses the underlying UNIX system as much as possible (so, for example, your routines are not stored in the database!)
Personally I am working on a utility that wraps GT.M in an "environment" similar to a Python virtualenv, but I'm not sure I'm ready to show my baby to the world yet...
http://tinco.pair.com/bhaskar/gtm/doc/books/
It's easy to put a CGI interface on top of GT.M - performance is quite good.
http://71.174.62.16/demo/TestCGI.htm
Personally I am working on a utility that wraps GT.M in an "environment" similar to a Python virtualenv, but I'm not sure I'm ready to show my baby to the world yet...