Ethereum alternative to bitcoind A client have payment system that uses bitcoind wallet / daemon.

I know he can expand to litecoin / dogecoin by just copy litecoind / dogecoind then console commands are almost the same.

I am wondering if same possibility exists for Etherium?

What software I need in order to replace bitcoind? I googled already, but I can not find anything.
Ethereum nodes are geth and parity.

Unlike Litecoin and Dogecoin, Ethereum is not a derivative of Bitcoin. Thus, the RPC interface is completely different, and you will not be able to simply point an existing  Bitcoin based system at the ethereum node. You will likely need to rewrite whatever you require to work with Ethereum APIs.