Hyperledger is an umbrella project of open source blockchains and related tools, started by the Linux Foundation. The technologies include Fabric, Sawtooth, Burrow, Indy, etc.
Ethereum is an open-source, public, blockchain-based distributed computing platform and operating system featuring smart contract functionality.
Quorum is an enterprise version of Ethereum with high speed and high throughput processing of private transactions within a permissioned group of known participants.
Corda removes costly friction in business transactions by enabling institutions to transact directly using smart contracts, while ensuring the highest levels of privacy and security.
BigchainDB is a scalable blockchain database. It’s designed to merge the best of two worlds: the “traditional” distributed database world and the “traditional” blockchain world.
Chain Core is infrastructure software that enables institutions to issue and transfer financial assets on permissioned blockchain networks.
Blockstack is building an ecosystem that gives your users control over their fundamental digital rights: Identity, data-ownership, privacy, and security.
EOS.IO is a blockchain protocol that enables horizontal scaling of decentralized applications, allowing developers to efficiently create high performance distributed applications.
IOTA is a distributed ledger designed to record and execute transactions between machines in the Internet of Things (IoT) ecosystem.