Google Contacts, the address book built into Gmail, lets you keep track of all your contacts, see when you last interacted with them, and more.
Send signed clients a welcome with their scope and first steps.
Your new client gets a personal welcome after signing, with clear first steps and a link to share files.
Send approved client agreements before work begins.
Your agreements reach the right signers, with a signature request link beside the document in your handoff note.