Strictly speaking, Nanowrimo isn't a resource, but since it has helped millions of writers the world over, it has earned its place as an icon in the world of scribes.
Writers over the globe anticipate National Novel Writing Month (November each year) which is when they can cast aside their inhibition and lock up their internal editor while writing to their heart's content.
The aim is to write 50,000 words in 30 days and while many do not have a complete novel at the end of November, a vast amount of writers go on to polish and publish their NaNo novels in the following months.
Nanowrimo is so immensely popular, it has spawned CampNaNoWriMo (that's where you write a novel in a month) and A Young Writer's Programme. In 2015, over a billion words were written during NaNowrimo.
If you haven't yet tried it, pop on over to the site and see if it may possibly be your big adventure in 2016.