A free program for Android, by Kokajin Applications.

Chess Clock – Game Timer & Stats is an Android app that lets you turn your phone into a chess clock. You can select from 3 modes of time controls and 3 types of delays. The modes are Classic, Hourglass, and FIDE. The Chess Clock APP includes many features, such as the ability to pause and resume games, the ability to choose between landscape and portrait orientation, different time settings for both players, showing player names and additional countdown for Bronstein and simple delay, and stage progress for FIDE clocks. The move counter and full-screen display are also visible. You can select from 100 different color combinations for the clock’s digits. Try it now!