Online Resources

Random Problem Generators

Random generator for binary CSPs written by Peter Schlette as a modification of the generator of Christian Bessière (LIRMM), which was itself previously modified by Shant Karakashian to output the results in XCSP2.0 format. This generator:
1. guarantees that the network is connected (both by checking on the number of constraints before generating the graph and also by checking the connectedness of the generated graph;
2. writes each generated instance into a separate file (when the option "-f myFileTag" is used) .
Schlette's generator is new and has not been tested extensively. So, use with caution, test it first. If you can improve on it, please send us your improvements.
RBGenerator: A Generator for Random CSP in JAVA using Model RB by Lecoutre et al.
A Generator for Random CSP in JAVA by Bart G.W. Craenen.
The RandomCSP Library by J.I. van Hemert.
Instances of forced satisfiable CSPs and SAT Benchmarks of Model RB by Ke Xu.
Random generator at LIRMM by Christian Bessiere. Apparently this generator may generate networks that are not connected. Use with caution, or avoid using.
Random generator in C courtesy of Fahiem Bacchus (and P. van Run).
Pointers to various generators from the ConSystlab web page.

Puzzles Built @ the ConSystLab

Interactive Minesweeper. Built by Robert Woodward (2007--present), K. Bayer (2006--2007), J. Snyder (2005).
Interactive Sudoku Solver. Built by Ch. Reeson (2006-2007), Angelo @ISI (2007).

Benchmark Problems

The list of benchmark problems usually used in the CP Solvers programming competetion. Check also the related tools.
The organizers of the International Workshop on Constraint Propagation and Implementation organize a Solver Competition and make available the benchmark problems used during the competition. Such as the ones used in the 2005 competition. Such problem instances are typically written using the new standards for representing CSP instances: an XML representation and also a table representation.
CLib: Configuration Benchmarks Library.