Both myWriteClub and Pacemaker are amazing resources if you’re trying to set a goal, with a deadline, and stick to it. Both of them are websites that give up the capability to set a goal of a certain amount of words by a certain time (e.g. 50,000 words by November 30th 2016.). I use both of them and love them both for different reasons.
I love myWriteClub because it has a very clean, simple, non-distracting design which comes in handy because it also includes the ability to sprint with others around the globe or to set a custom sprint. I’ve learned that I write best when I’m just getting the words down and completing against other word counts.