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NIST Expresso is a language environment for the ISO EXPRESS (ISO10303-11) and Express-X languages, providing tools to aid in the development and validation of EXPRESS information models and representative data sets.
Written in ANSI Common Lisp.
This site: http://www.mel.nist.gov/msidstaff/denno/nist-expresso.html is being superceded by a sourceforge site: http://exp-engine.sourceforge.net/But the former has more complete info on the project.
This is my first post, supposed it might be interesting here, although it might also be somewhat esoteric stuff.
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Expresso, environment for ISO 10303-1