Instructify.com is chock full of reviews and links to free resources for instructors. While the main demographic seems to be K-12 instructors, there are certainly tools here for college writing courses. The site is a bit clunky and silo-y, but the resources reviewed here are incredibly useful. With close to 1,500 posts there is surely something here for everyone.
I am particularly drawn to the “writing” tag (of course) – instructify.com/tag/writing. This tag features reviews of gems like Let Them Sing it For You, comic strip creators, Vintage Technology, and more. Remember, all the tools and resources featured on Instructify are free.