XRP Toolkit is a web interface for managing your XRP Ledger account without giving up custody. You use it to send and receive XRP, manage trust lines, set account flags, and place orders on the XRPL decentralized exchange. You connect a wallet like XUMM to sign transactions while your keys stay in your control.
XRPToolkit Showcase and Tutorial
How to Set up a trustline on the XRP ledger w/ xrptoolkit and ledger nano X