Spark - SPARK, SPADE high-integrity software development products; annotated Ada subset supports developing software for uses where correct operation is vital for safety or business integrity; versions based on Ada 83/95. [Praxis Critical Systems Ltd.] - http://www.praxis-his.com/sparkada/
SmallAda - A compiler/interpreter for a part of the Ada language, namely the "Pascal subset" plus the Ada tasking support. It is not intended ever to be a full Ada compiler, rather a vehicle for teaching, learning, and experimenting with concurrent prog - http://www.readyideas.com/ada/SMALLADA.ZIP
AdaCLIPS - A small set of Ada (95) bindings to the CLIPS expert system shell. - http://www.telepath.com/~dennison/Ted/AdaClips/AdaClips.html