Timebase is very good tool for collecting detailed information about customers: contacts, bank accounts, messages sent, documents. It is easy to see how much each customer owes, amounts overdue or overall profitability.
Export the list of all your clients in Excel.
See your current revenue balance.
Monitor the status of paid/not paid invoices for each client.
See all projects you are working on for specific client.
Add all information of new and existing clients.