From the site where these packages were downloaded: 

The source code for my various rubik solvers are freely available. They are, for the moment, released GPL (e.g., free to distribute and modify but it and its derivitives must always remain free and open source). There are a number of sources which may be of interest: 

2x2x2 solver source - CGI and command-line version
3x3x3 solver source - CGI version
3x3x3 solver source - command-line version
3x3x3 solver binary - command-line version (executable only)
3x3x3 solver source for Kociemba's method - command-line (not written by me)
4x4x4 solver source - CGI version
4x4x4 solver source - command-line version
4x4x4 solver binary - command-line version (executable only)
