PegaSys (Protocol Engineering Groups and Systems) is a 50-person team dedicated to enterprise grade blockchain at ConsenSys. Alongside supporting the public Ethereum Mainnet, the team works on privacy, permissioning, scalability, and other features to make Ethereum production-ready for enterprise adoption.
The PegaSys Ethereum 2.0 client is called Teku (formerly known as Artemis). It is being built alongside Besu, an Ethereum 1.0 and enterprise-grade client written in the Java programming language. Both Artemis and Besu are Apache 2.0 licensed.