I officiate a mens league in the Summer and the league doesnt supply score or timekeepers. I strapped my iPhone to my arm and used this app to keep time and the score. It worked great! The games were non-traditional running clock games and I was able to customize the quarter and penalty time.
The only things I would add are a timer for when the clock is stopped (TOs & halftime) and the ability to change colors of home and away.
HockeyinKC about LAX Time & Score