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National Novel Writing Month - An international phenomenon celebrated once a year in November. Participants write a 50,000 word novel in 30 days. The NaNoWriMo parent company, Office of Letters and Light (OLL) also runs Script Frenzy for script writers in the first half of the year.
Daily Prompt - Writing prompts from Twitterverse. (You don't need to be on the site to find value in these.
wink )
The Scriptorium - Writing resources.... I have the
Fantasy World Builder bookmarked, for example.