• NEOS Server for Concorde - allows users to solve TSP instances online.
• LKH - Keld Helsgaun's variant of the Lin-Kernighan heuristic.
• TSPLIB - Gerd Reinelt's library of TSP instances.
• TSPBIB - Pablo Moscato's listing of TSP references.
• 8th DIMACS Implementation Challenge - Testing of TSP heuristics.
• Jesper Larsen's Papers on the TSP.
• A Farmer's Daughter in Our Midst - An interview with Vašek Chvátal.