Linux Test Suites -- The Open Group was a contributor to the LSB testing project, contributing several of its test suites to support the Free Standards Group LSB Certification, including the TET/VSXgen framework, the VSX-PCTS1990, LSB-OS, LSB-FHS, VSTH-lite, VSW4 and XTS5 test suites.

VSX-PCTS2003 - The official POSIX® Conformance Test Suite for the 2003 edition of IEEE Std 1003.1 System Interfaces derived from the industry leading VSX4 verification suite , this is available under a no fee license for commercial organizations planning to undertake POSIX® certification or for Open Source projects.

VSC-PCTS2003 - The official POSIX® Conformance Test Suite for the 2003 edition of IEEE Std 1003.1 Shell and Utilities (formerly POSIX 1003.2) this is available under a no fee license for commercial organizations planning to undertake POSIX® certification or for Open Source projects.

TET Release 3 - the Open Source(tm) version of the Test Environment Toolkit, implementation and contributed test suites. For more information see http://tetworks.opengroup.org

The LSB-VSX Test Suite - A version of the VSX-PCTS1990 test suite, tuned to autoconfigure and test Linux systems for POSIX conformance.

Linux Standard Base FHS2.0/2.1/2.2/2.3 Test Tool - a test suite for the Filesystem Hierarchy Standard.

VSTHlite Test Suite - A test suite for a subset of pthreads - POSIX 1003.1-1996 threads. This is a lite version of the Open Group's full Threads Test Suite (vsth)

System Header Checker - hdrchk is a development tool. It performs a check on system headers for presence of function declarations, macro definitions and structures as defined in various standards. The standards supported by this tool are: FIPS 151-2, POSIX.1-1990, POSIX.1-1996, XPG3, XPG4 and UNIX 98.