A collection of tools, interfaces and libraries around the Polkadot project. Polkadot does JavaScript. An alternative Polkadot Runtime Environment implementation acting as a full-node (excluding block production for validators) for syncing with Substrate-based chains. A JavaScript version of a Polkadot/Substrate network client. It allows operation in full and light nodes fullfilling all functions of chain operation, however does not include the ability to author blocks (i.e. run as a validator on the network).