Similar to the monero cryptocurrencies, Zcash shields transactions to hide the sender, receiver and what is being sent, although it's a bit different.
Zcash uses a secure encrypted hashing system which is said to be unbreakable by even Quantum computing which we will see disrupting a lot in the future.

Other than Zcash and Monero:

Dash is another one: Dash is faster than most coins and uses a multiple transaction and verification methodology to keep your privacy safe.