I have added a web interface to my Javascript Sudoku solver. It is available here. You can input puzzles in multiple ways, for example via direct input, URL or text selection. It should be the fastest Javascript solver to date.
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Attractive Chaos 
I tried your solver, seems really hard to input. The puzzle allows me to enter values but I can’t seem to make it solve.
I have a solver, maybe something more visual might make it easier to enter input.
My Solver: http://vantasyworld.com/fun/sudoku/sudokusolver.html
You can write in the grid and just press the “solve” button. Also, those “serious” solvers all take the input as strings such that they can solve multiple puzzles in one go. With yours, I cannot test the speed. I do not want to input each by hand.
Usually solvers that takes a single input do not care about speed, while solving a Sudoku efficiently is what really interests me.
Also – I have not read the source code – your solver is not in javascript. Right?