This is a Countdown solver. With this tool you can enter inputs from Countdown letters and numbers games and have solutions calculated.
No promises are made about the completeness of the dictionary for the letters game solver, though the numbers game solver is able to solve any solvable game. The letters game solver is also useful for solving the Countdown Conundrum and the Teatime Teaser.
This is the shiny new solver. If you really want the old one, it's still available here.