THE TTCN-3 SOFTWARE TESTING FRAMEWORKTTCN-3 is a general testing language, internationally standardized by the European Telecommunications Standards Institute (ETSI) and the International Telecommunication Union (ITU).
FRAUNHOFER FIRST TTCN-3 implements the language described in
This language is defined by the standard document TTCN-3 CORE LANGUAGE (ES 201 873-1 2.2.1).
The TTCN-3 TUTORIAL introduces the language and describes how to implement codecs and adapters.
The TTCN-3 Release for Microsoft .Net that was published in 2005 by Fraunhofer FIRST. It is no longer maintained.