USB Sudoku - A very small program for playing the original game of Sudoku.
HoDoKu - HoDoKu is a sudoku helper written in Java and available in English and German.
Minimal Sudoku - Minimal Sudoku is an easy to use, clutter-free classic sudoku game which is designed for iOS 7.
Yasminoku - Sudoku game and solver totally written in DHTML.
Simple Sudoku - Freeware Sudoku Puzzle Maker and Solver
Planet Sudoku - Play millions of free Sudoku puzzles online for kids to experts. Sudoku puzzles like 9x9, Samurai, 4x4, 6x6, 8x8, 12x12, 16x16, 20x20 and 25x25.