Integer and Mixed-Integer Programming Problems

Bienstoc
     A hard mixed integer problem in LP format contributed by D. Bienstock,
     z_ij variables are 0-1 (56 total), all other variables are continuous
    (approximately 400).

MIPLIB
     Mixed Integer Programming problem library, see R.E. Bixby, E.A. Boyd, and
     R.R. Indovina: MIPLIB: A Test Set of Mixed Integer Programming Problems,
     SIAM-News 25, 2 (1992), p.16.

SAC-94 Suite
     General 0/1 Integer Programming (Multiple Knapsack) problems contributed
     by J. Heitkötter.