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A homeschooler friend recommended this from IEW. There’s so much on this site, just start digging.
NaNoWriMo (National November Writing Month) is a nonprofit that helps writers complete novels. Their Young Writer’s Program is for under 18. Currently they’re doing StayHomeWriMo and have another project coming up in April. The kids love the November one and have done it several times.
Write at Home – Middle and high school writing courses
Don’t Forget to Write – no personal experience with this one, but Dave Eggers is somehow involved, and I’ve seen it recommended in so many places. Worth checking out at least. The writing for pets and jokes and riddles chapters definitely got my attention.
Storybird – this is a really cute site for helping kids write their stories. It’s worth checking out. For all ages.