ttcn-el is a package by W. Martin Borgert for editing TTCN files.

Both Tree and Tabular Combined Notation (TTCN-2) as well as Testing and Test Control Notation (TTCN-3) are supported. The original implementation can be found on Martin’s page, An updated version which is compatible with cc-mode 5.32 (bundled with Emacs 23) is available at