Daniel Porumbel and Jin-Kao Hao. Distance-guided local search. Journal of Heuristics, 2020.

The source code of the DGLS algorithm along with several instances is available here and at Daniel's site 

1) Please make sure that the above paper is cited if you use the code in your research.
2) The software is distributed for academic purposes only. If you wish to use this software for commercial applications, please contact the authors.