Eris is not a single blockchain, it is an open modular platform developed by Monax for development of blockchain-based ecosystem applications. It offers various frameworks, SDKs, and tools that allow accelerated development and deployment of blockchain applications.
The core idea behind the Eris application platform is to enable development and management of ecosystem applications with a blockchain backend. It allows integration with multiple blockchains and enables various third-party systems to interact with various other systems.
This platform makes use of smart contracts written in Solidity language. It can interact with blockchains such as Ethereum or Bitcoin. The interaction can include connectivity commands, start, stop, disconnection, ...