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.
There are currently two data files. The first data file is flowshop1 This data file contains 31 test instances commonly cited in the literature. The format of these test instances is described within the file. The second data file is flowshop2 This data file contains PASCAL- and C code for generating flow shop scheduling instances. These instances are given in "Bench- marks for basic scheduling instances" by E. Taillard, European Journal of Operational Research 64, (1993), 278-285. The first file is of size 82Kb (approximately); the second file is of size 22Kb (approximately).
Click here to access these files
Other test problems are available here