Parahumans, also called the Worm-verse, is a name sometimes used to refer to the series of stories begun by Worm, written by the author J.C McCrae aka Wildbow.
An later story set in the Worm universe, PRT: Department Sixty-Four, was published elsewhere (on the SpaceBattles forum.) This story was an interactive "quest" rather than a traditional story, with the protagonist's actions determined by vote and the villains' actions determined by a number of roleplayers. As such, it is only considered partially canon.
Following the completion of his other stories Pact and Twig, Wildbow returned to the Worm universe. Parahumans.wordpress.com was finally used to post a short story in the same universe, Glow-worm, a prequel to the then-upcoming Ward.