Axelar

LayerZero is an omnichain interoperability protocol. LayerZero enables the realization of cross-chain applications with a low level communication primitive.

Celer is a blockchain interoperability protocol enabling a one-click user experience accessing tokens, DeFi, GameFi, NFTs, governance, and more across multiple chains. Developers can build inter-chain-native dApps using the Celer Inter-chain Message SDK to gain access to efficient liquidity utilization, coherent application logic, and shared states. Users of Celer-enabled dApps will enjoy the benefits of a diverse multi-blockchain ecosystem with the simplicity of a single-transaction UX, all from a single chain.

A cross-chain protocol backed by Solana. In October 2022, Solana released an Ethereum token cross-chain bridge.