Currently, all existing formal tools are designed to serve as formal verifiers, using one implementation or another. NO tool is providing a global framework to develop algorithms.
Silicis is a new formal framework for designing [verification] algorithms.
Very fast and easy to use Java tool for solving and generating Sudoku puzzles. By using Donald Knuths exact cover algorithmus it can not only solve or create the usual 9x9 but also 4x4, 16x16 or even bigger Sudokus in a very efficient way.