@Moon @rasterman @djsumdog @olmitch again, I'd recommend Rudolph's book on the topic.
Gnosticism is a class, and never converged on a "gnostic orthodoxy". Of those faiths, the Mandeans still exist. The largest and most impactful were the Manicheans.
Modern gnostic cults include freemasonry. They tend to claim antiquity as an origin, but are only related in their esoteric elitism.