From Supermanifold Software:
A poker blinds timer for Texas Hold'em tournaments. Tournament Timer provides an easy-to-use blinds-level editor, along with an assistant to help get you started. There is a full-screen mode for the actual timer.
Version 0.17 updated Display window, in which the current blinds are more prominent for improved readability. Additionally, the ability to set the sounds at the end of blinds/breaks and the length of breaks has been introduced.