Here is a list of some notable decentralized cross-chain bridge platforms:

Cosmos: Cosmos is a decentralized cross-chain bridge platform that enables communication between independent blockchain networks. It uses a hub-and-spoke architecture, with the Cosmos Hub acting as the central hub that connects different blockchain networks.

Polkadot: Polkadot is a sharded multi-chain network that enables cross-chain communication between different blockchain networks. It uses a relay chain to connect different parachains (parallel chains), allowing for the transfer of assets and data between them.

Wanchain: Wanchain is a decentralized cross-chain bridge platform that allows for the transfer of assets between different blockchain networks, such as Bitcoin and Ethereum. It uses a secure multi-party computation (MPC) protocol to ensure the security and privacy of transferred assets.

Chainlink: Chainlink is a decentralized oracle network that provides data to blockchain applications. It also enables cross-chain communication by providing secure and reliable data feeds to multiple blockchain networks.

Arkane Network: Arkane Network is a blockchain middleware platform that enables developers to build and manage decentralized applications (dApps). It also provides cross-chain functionality by allowing for the transfer of assets between different blockchain networks.

Binance Smart Chain: Binance Smart Chain is a decentralized blockchain platform that enables cross-chain communication between different blockchain networks. It uses a dual-chain architecture, with the Binance Chain acting as the main blockchain and the Binance Smart Chain acting as a parallel chain for executing smart contracts.

Thorchain: Thorchain is a decentralized cross-chain liquidity network that enables the transfer of assets between different blockchain networks. It uses a decentralized autonomous organization (DAO) structure to govern the network and ensure security and transparency.

These are just a few examples of decentralized cross-chain bridge platforms that are currently being developed and used in the blockchain ecosystem. There are many other projects working on similar technologies, and the field is rapidly evolving as the blockchain ecosystem continues to grow and mature.