SciDAC QFT Data Parallel library
Documentation from the QDP version 1.8.0 release in postscript, pdf and html.
The materials from the SciDAC 2007 tutorial are here. Some simple step-by-step instructions for installing QOPQDP and all it's dependencies (QDP/C, QLA, QIO and QMP) can be found here.
Current and past releases can be found here.