OR-Library

J E Beasley

OR-Library is a collection of test data sets for a variety of OR problems.

A full list of the test data sets available in OR-Library can be found here.

Quadratic assignment

OR-Library does not have any test problems for the quadratic
assignment problem.

However a number of quadratic assignment test problems have
been collected by:

Franz Rendl
Institut fur Mathematik B
Graz University of Technology
Kopernikusgasse 24
8010 Graz
Austria

e-mail: rendl@kop.tu-graz.ada.at

See "QAPLIB - a quadratic assignment problem library"
by R.E.Burkard, S.Karisch and F.Rendl, European Journal
of Operational Research, vol. 55 (1991) 115-119.

QAPLIB is WWW accessible here and here 

OTHER SOURCES

Other test problems are available here

Some test problems can also be found here, here and here