https://moneroforcash.com/monero-vs-dash-vs-zcash-vs-bitcoinmixers.php
ok this is truly commercial adverticement for Monero from a Monero business
but it’s a frist good overview
to complete the list (what I know)
https://zcoin.io - they burn the coin/token after an transaction
https://navcoin.org/faq/ (they use 2 chains for anonym transactions)
https://pivx.org/de/home_de/ no clue what they do