*[https://github.com/blynn/dlx Free Software implementation of Algorithm X in C] - uses the Dancing Links optimization. Includes examples for using the library to solve sudoku and logic grid puzzles.
*[https://github.com/mlepage/polycube-solver Polycube solver] Program (with Lua source code) to fill boxes with polycubes using [[Algorithm X]].
*[http://www-cs-faculty.stanford.edu/~uno/papers/dancing-color.ps.gz Knuth's Paper describing the Dancing Links optimization] - Gzip'd postscript file.
