A set of instances from the ROADEF‘05 challenge can be found here. They do not comply with the CSPLIB format and have additional constraints.

File Type Notes
CarSequencing-essence.zip zip Some instances in Essence format. Includes all instances from data.txt, and the "instance 0" from Regin & Puget.
data.txt txt with best known results results/result1.html
ProblemDataSet200to400.zip zip 30 new hard problems from Caroline Gagne