Hyperledger is an open-source collaborative project hosted by the Linux Foundation. It aims to advance cross-industry blockchain technologies by developing enterprise-grade distributed ledger frameworks and tools. Unlike public blockchains like Ethereum or Bitcoin, Hyperledger focuses on permissioned and private blockchains tailored for business and enterprise use cases. Some of the popular hyperledger frameworks include Hyperledger Fabric, Hyperledger Besu, Sawtooth, Iroha, Indy etc.