There are several French occult traditions that claim descent from the Cathars, though I don't know them well enough to gauge the accuracy of the claim. The episcopal lineage of the Universal Gnostic Church, interestingly enough, includes one of those traditions, the Johannite Gnostic line:
(no subject)
Date: 2025-03-03 05:10 am (UTC)https://ecosophia.dreamwidth.org/239168.html
There are also several surviving works of Cathar literature, which have influenced many modern Gnostic lineages:
http://gnosis.org/library/cathtx.htm