OrbitDB

Alloy is a set of libraries that provides types and RPC client implementations for Ethereum.

ethereum-lists/chains is the canonical metadata list for EVM chains, covering chain ID, name, native currency, and RPC URLs. Builders pull chains.json from it to populate wallet and network configuration instead of hardcoding chain data.

Chainlist is a directory of EVM chain IDs and public RPC endpoints that developers and wallets use to add a network. The repository is the source of chainlist.org.

go-libp2p is the canonical Go implementation of libp2p, packaging transports, identify, DHT, and GossipSub modules relied on by Prysm, Lotus, Celestia, and other large-scale clients that need production-grade peer discovery and messaging.

Helios from a16z is a portable light client that serves verified Ethereum and other chain data without trusting an RPC provider. Builders run it or embed the Rust library when an application must check the data it receives.

js-libp2p is the JavaScript implementation of libp2p transports, security, pubsub, and discovery-used by Farcaster hubs, Lodestar-related tooling, and other off-chain coordination stacks.