zerocash
There are 3 repositories under zerocash topic.
clearmatics/zeth
Integration of Zerocash on Ethereum: https://arxiv.org/abs/1904.00905
ShashvatS/anonstake
Code for AnonStake selection proofs
UVNishanth/spartan-dark
an anonymous transaction system similar to Zcash, built on top of spartan-gold