Basics: securitisation ccy/nft standards (live), dapp interaction like beacon/tezbridge (live), zksnarks (beta), layer 2 (dev)
Apps: Dexter(beta), Quipuswap(beta), tzbtc (live), usdtz (beta), securitisation standards (live), checkers stablecoin (dev), TezSure insurance (dev), many wallets existing
Missing: compound/flash loans/prediction markets
