HL7Spy desktop tool
I cannot say enough about Inner Harbour's HL7Spy desktop tool. The ability to query message stores and write custom C# transformations is invaluable for HL7 2.x message analysis and statistics. The 3.x version is really something. Just can't say enough about this powerful tool. (Sorry no CCDA or FHIR capabilities) but if you live in the world of "pipes" and "hats" (HL7 2.x) - you'll like this little (powerful) program.