Argo is a secure, decentralized stablecoin for Aptos. USDA live on Aptos mainnet day 1.
Apscan is the Aptos Blockchain Explorer and allows you to explore and search the accounts, blocks, transactions, assets and other network activities within the Aptos Network (APT).
Patronus is a DeFi Liquidity Protocol which aims to provide a suite of DeFi products and services for a safer and more efficient capital flow.
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.