Afterburner is an OC software, which loads a tester called KOMBUSTER which is based on furmark.
All stress testing is done with third party software
except intel extreme tuning facility
Which isnt included so may be third party, but its by intel for intel... so it isnt really.
Prime has been so heavily adopted by the pc community it is an indtustry standard for benchmarks and the creators made a sideline function just for stress testers.
Any of the programs listed by corndog are perfectly fine.