TetWorks (sic) is also known as TET.
Quote, from "What is the Test Environment Toolkit (TET) ?"
"The TET is a universal management and reporting framework for conformance test campaigns. It provides what is effectively a standard API between the test code and the overall test process. TETware is the latest revision of the Test Environment Toolkit, and now supports both multi-platform and distributed testing across UNIX® operating systems , Windows NT® , Windows 95 and Java® environments"
http://tetworks.opengroup.org/
TET and DejaGnu both attempt to implement the POSIX test framework (see the DejaGnu documentation for a description)