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It's anonymous when destination address & the amount sent are not seen by anyone. Zcash, Monero are anonymous by default.
However for Dash, you can specify whether your transaction is private or public.
Komodo is a forked version of Zcash. And Zcash implements zero-knowledge proofs which are known to protect recipient's anonymity however, there are some debates about that, http://www.coindesk.com/investors-know-trading-zcash/
If you want to learn more about other coins, check out http://coingenius.io