Currently, there are six projects under the Hyperledger umbrella: Fabric, Iroha, Sawtooth lake, blockchain explorer, Fabric chaintool, and Fabric SDK Py. Corda is the most recent addition that is expected to be added to the Hyperledger project. The Hyperledger project currently has 100 members and is very active with more than 120 contributors, with regular meet-ups and talks being organized around the globe.
A brief introduction of all these projects follows, after which we will provide more details around the design, architecture, and implementation of Fabric and Sawtooth lake.
Fabric is a blockchain project that was proposed by IBM and DAH (Digital Asset Holdings). This is intended to provide a foundation for the development of blockchain solutions and is based on pluggable architecture where various components, such as consensus algorithm, can be plugged into the system as required. It is available at https://github.com/hyperledger/fabric.