This is what I used last year to get through NaNoWriMo. It’s called Write or Die. I use to just do it off the website but I used it so much I just gave in and bought the desktop version. It’s easy to use and not that expensive.
This program doesn’t actually kill you if you stop writing; don’t worry you’re not in danger. Instead what it does is it stops you from getting distracted. When I write without Write or Die I usually take frequent brakes to go check Facebook or Twitter, not for very long but it still eats up a lot of my time.
With Write or Die if you stop writing the program gets angry and prompts you to get back to writing. First the screen starts to turn red and then it starts making annoying noises until you get back to work. The weirdest thing is that it works. As soon as that screen starts to go red for me I get right back to writing until I meet my word count.
Before your writing session starts you plug in your word count goal and how much time you think you need to reach it. I usually do 1100 words in 30 minutes. Who doesn’t have 30 minutes to spare? Once it starts there are two bars at the top of the window, one to track your time and one to track your word count. Just make sure your word count is always ahead of your time.
There are other modes on the program that are more heavy on the consequences. One starts deleting words if you stop writing and another one deletes everything if you don’t meet your word count in the time specified. I’m not brave enough to try that one.
But avoiding the annoying noise is good enough for me. I’ll be using this almost everyday in November. You should give it a try as well. Here is a link.