Is it possible to use smart contract with cryptocurrency other than Ethereum?
Basically what i want is to use smart contract in place of traditional escrow method.
Yes! If I am understanding you correctly, you're referring to a token? With Ethereum, you are able to make your own ERC-20 token via a smart contract. Although the title of the question seems to be referring to inter-blockchain communication. This is also possible. Here are a few examples of projects that incorporate inter-blockchain communication:
Recently, Bancor and Aion teamed up to provide inter-blockchain liquidity which allows for "both data and value to transfer between chains".
Amberdata.io is working on implementing data analytics for inter-blockchain communication. For now, if you're interested in Aion you can explore their chain here.
In regards to an escrow contract here is a tutorial on how one might build it.
Hope that helps! 🙌