There are several cross-chain interoperability protocols available in the market, including:

Polkadot: Polkadot is a multi-chain framework that enables cross-chain communication between different blockchain networks.

Cosmos: Cosmos is a decentralized network of independent blockchain networks that enables cross-chain communication through the use of the Inter-Blockchain Communication (IBC) protocol.

Chain-link: Chain Link is a decentralized oracle network that connects smart contracts to external data sources, allowing for the creation of cross-chain applications.

Wan chain: Wan chain is a cross-chain platform that enables interoperability between different blockchain networks, including Bitcoin, Ethereum, and EOS.

Arkane Network: Arkane Network is a blockchain middleware solution that provides a unified API for developers to access different blockchain networks and build cross-chain applications.