Cubex is a Web-based Rubik's Cube solver that produces a highly-detailed solution for any mixed-up Rubik's Cube in seconds.
Sudognu is a command line sudoku solver and
creator. It can display the logical steps it uses
to find the solution. Sudognu can print four
sudokus to a PDF page, and it comes with example
CGI scripts for integration into Web sites.
An full text search engine and column store..
An 8-bit clean, POSIX-compliant line editor.