This is a simple Quartz demo app, complete with Keplr-based frontend. It allows users to deposit funds to a contract, transfer them around privately within the contract's encrypted state, and withdraw whatever funds they have.
See the getting started guide to get it quickly setup on a local testnet without SGX or on a real testnet using an Azure SGX node.
See this video of an early demo of the app at the Flashbots TEE-salon.