A Windows password cracker based on rainbow tables
Ophcrack is a Windows password cracker based on a time-memory trade-off using rainbow tables. This is a new variant of Hellman's original trade-off, with better performance. It recovers 99.9% of alphanumeric passwords in seconds.
Software to balance a chemical equation (redox too)
Balacing a chemical equation using the Laplace's rule to solve a system of linear equations or using the brute-force method.
Khembalancer 2.5.5 received the "100% Free" award and that means Khembalancer does not contain any viruses, spyware, trojans and backdoors.
For more information see: http://www.softpedia.com/progClean/Khembalancer-Clean-207422.html