Stellar is an open-source, distributed payments infrastructure. It is a leapfrog technology that connects people, payment systems, and banks with a focus on the developing world.
ZCash is a privacy driven cryptocurrency. It uses the Equihash as an algorithm, which is an asymmetric memory-hard Proof of Work algorithm based on the generalized birthday problem
Bitcoin is the most secure and robust cryptocurrency in the world, currently finding its way across the world of business and finance. Bitcoin was thought of as Internet money in its early beginnings. Unlike fiat currencies Bitcoin is a decentralized currency.
Ethereum is an open platform that enables developers to build and deploy decentralized applications, Ethereum allows participants to run decentralized blockchain applications called Smart contracts!