Drivechains, Side chains, Spider chains, Soft Chains, Space Chains, Cross Chains, Anchored Chains, Rollups, ecash, Mints, Lightning, Liquid...argggh. Just took another peek at Jameson Lopp's excellent Bitcoin Information page:

https://www.lopp.net/bitcoin-information/other-layers.html

It's a couple of years since I started pealing the Bitcoin layer 2 onion and I still don't feel like I'm any closer to having a decent grasp.

Which of the L2s enable final settlement of payments in addition to clearing without recourse to the underlying UTXO?