Tortuga

Multichain is a non-custodial cross-chain router protocol symbolizing decentralization. It processes Multichain cross-chain bridging and smart contract methods on other chains. Multichain’s 1:1 bridge enables users to perform 0 slippage transfers and eliminate the hidden cost associated with AMM. Multichain Router allows users to swap between any two chains freely, reducing fees and making it easier to move between chains.

Ferum is an on-chain order book on Aptos that stands out for its developer-friendly features. It provides a platform that is easy to navigate and use, making it an ideal choice for developers working with Aptos.

Tsunami Finance is a platform that offers margin trading and spot exchange services. It's a dynamic platform with documentation that is continually being updated and improved. Users are encouraged to contribute by submitting a pull request for any changes they deem necessary.