Raydium's AMM and staking programs have been reviewed by engineers from Solana and fully audited by Kudelski Security and can be found here. These programs have since undergone updates, and while a full re-audit has not been done, members from the Neodyme team have done extensive reviews via a bug bounty agreement.
AcceleRaytor, DropZone and stable-curve AMM programs have not yet been audited however Raydium is planning for an additional full audit in Q2 of 2022 that will review all upgrades and more recent programs.