Level 1, Level 2, and Level 3 packages can be built independently of the applications and used in your own codes if you wish. However, please heed this warning:
Given the number of modules and the combinatorically larger variety of possible ways to combine them, we suggest that if you are new to this game you can save yourself a lot of frustration by checking out one of the application suites above.

Having said all that, the currently available Level 2 SciDAC modules are described and listed below:

QDP/C++ Maintainer: Balint Joó (bjoo[at]jlab[dot]org)
Source codetar-ball   repository
Web sitehttp://usqcd-software.github.io/qdpxx
Reference to cite:  R. G. Edwards (LHPC Collaboration), B. JoĆ³ (UKQCD Collaboration), "The Chroma Soft ware System for Lattice QCD", hep-lat/0409003, Proceedings of the 22nd International Symposium for Lattice Field Theory (Lattice2004), Nucl. Phys B1 40 (Proc. Suppl) p832, 2005.
Level 1 QMP

QDP++ is the C++ implementation of the QDP (QCD Data Parallel) interface. This implementation is fully integrated with QMP, QIO and provides extra XML I/O features using the 3rd party LibXML2 library. page.

QDP/C Maintainer: James Osborn (osborn[at]alcf[dot]anl[dot]gov)
Source codetar-ball   repository
Web sitehttp://usqcd-software.github.io/qdp/
Reference to cite
Level 1 QMP and QLA

QDP/C is the C implementation of the QDP (QCD Data Parallel) interface. It provides for lattice wide operations as well as lattice wide communications and uses the QMP, QIO and QLA libraries.

Bagel QDP Maintainer
Source codetar-ball   repository
Web sitehttp://usqcd-software.github.io/bagel_qdp/
Reference to cite???
Level 1 QMP and QLA

The BAGEL QDP module is used to produce some optimized linear algebra routines for use by QDP++ on  some machines such the QCDOC and the BlueGene. It requires the 3rd Party BAGEL Assemb ly Generator package to work. If you wish to use the BAGEL Assembly Generator, you have to Acknowledge its use in any future publications, see the  BAGEL Assembly Generator for details.   A word of  warning: The BAGEL Assembler Generator page hosts an old copy of the BAGEL QDP module which is now out of date for recent versions of QDP++ despite its seemingly recent version number of (1.4.0). Please use the version linked to from here instead.

QIO Maintainer: James Osborn (osborn[at]alcf[dot]anl[dot]gov)
Source codetar-ball   repository
Web sitehttp://usqcd-software.github.io/qio
Reference to cite
Level 1 QMP

QIO provides as suite of input/output routines for lattice data. It contains the SciDAC LIME implementation. By default QIO uses QMP for its parallel communications although it can also be built in scalar mode in which case no communications harness is required.

C-LIME Maintainer
Source codetar-ball   repository
Web sitehttp://usqcd-software.github.io/c-lime/
Reference to cite
Level 1 QMP

This module provides the LIME record structure for LIME files. It is used by QIO but you can also use it on its own.