The libp2p Project.
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