hi,
bolt labs have developed /are developing zk state channels on top of Tezos.
I’m certain I have heard of other projects, but I haven’t looked into them.
https://medium.com/boltlabs/introducing-zkchannels-on-tezos-c365830b9efd?source=collection_home---6------0-----------------------
There is(?) plasma on Tezos
Obviously Marigold
https://medium.com/tezos/marigold-layer-2-scaling-for-tezos-7445b5a3b7be
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