OP Mainnet uses go-libp2p.

Beacon Chain uses: go-libp2p, rust-libp2p, js-libp2p, jvm-libp2p, nim-libp2p

MetaMask uses js-libp2p.

Coinbase’s Pessimism real-time threat detection tool uses go-libp2p.

Mantle token governance platform uses go-libp2p.

Manta Network used rust-libp2p as a parachain and now as a zk apps solution

Andreessen-Horowitz’s Magi roll-up client uses rust-libp2p.

Celo blockchain uses EthereumJS that uses js-libp2p.

Unidex Finance uses EtherMint which uses go-libp2p.

Rollux has end-to-end tests that use go-libp2p.

Off Chain Labs’ Nitro tool uses go-libp2p.

libp2p Specifications

go-libp2p Implementation

rust-libp2p Implementation

js-libp2p Implementation

libp2p Transport Interop Testing

libp2p Test Plans

libp2p Hole Punching Interop Testing

libp2p CVE List

libp2p Website

libp2p Blog

libp2p Connectivity Infosite