Concorde's TSP solver has been used to obtain the optimal solutions to 106 of the 110 TSPLIB instances; the largest having 15,112 cities.
The Concorde callable library includes over 700 functions permitting users to create specialized codes for TSP-like problems. All Concorde functions are thread-safe for programming in shared-memory parallel environments; the main TSP solver includes code for running over networks of UNIX workstations.
Concorde now supports the QSopt linear programming solver. Executable versions of concorde with qsopt for Linux and Solaris are now available
Hans Mittelmann has created a NEOS Server for Concorde, allowing users to solve TSP instances online.