Flare
Flare is a crypto asset supported by Ripple and is designed to implement smart contracts on XRP ledger. It is developed to interoperate with various blockchains under the philosophy of "Connect Everything”.
The function called State Connector enables the secure acquisition of various blockchain states.
FAssets provides a smart contract executable environment for those crypto assets without smart contracts.
Also, Layer Cake can be used to improve the security and speed of bridging between different blockchain networks.