Ferum

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.

Ditto is a liquid staking solution constructed on the Aptos blockchain. It allows users to stake their Aptos tokens to earn yield and contribute to the decentralization of the network, all while maintaining liquidity. This means users can earn rewards from staking while still having the flexibility to use their tokens as needed.

Wing Finance is a credit-based, cross-chain DeFi platform. The content from this URL could not be retrieved, so I'm unable to provide a detailed introduction.