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Hyperledger is essentially broken into three categories, there is the Distributed Ledger Technology (DLT), basically blockchain, the libraries, and the tools. Fabric is a permissioned DLT framework that is enterprise-grade, with a modular design that gives you a great amount of flexibility in what you can do. Burrow is a modular blockchain client that contains a. permissioned smart contract interpreter that is partially developed to the EVM specification and is intended to run EVM smart contracts. Iroha is a self-sovereign identity ecosystem on top of a distributed ledger.