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Express Engine - used by SCL to validate models with schemas. Old website is here
IDA-STEP Viewer - free downloadable STEP file viewer
Jen-X p28 schema generator and p21-p28 mediators - for shipbuilding STEP AP's
STEP Tools - free on-line EXPRESS schema checker
STEP-toybox
Express for Free, also here
JSDAI
Reeper
OntoSTEP Protégé plugin
SEBNF2Pars - Creates Part 21 parsers from an EBNF representation
lgtstep - a Logtalk STEP implementation
Scripting Applications for STEP Part 21 files - uses Prolog
http://github.com/mvaerle/python-ifc
http://www.ifcgears.com/extender.php
STP2OWL
STP2X3D
ST-Developer