Crater Invoice is a Free & Open-Source app that provides a user with a suite of tools to manage their invoices. Users may create and send professional invoices to their clients. Our features include: Invoices: Create and manage professional invoices. Estimates: You can create and send estimates to a client. Track Payment: Users can keep a detailed history of their payments. Expenses: You can keep track of your spending with our easy to use expense tracker. Reports: You can get detailed reports regarding sales, taxes, expenses, etc. Taxes: You can input various tax types such as VAT, GST, etc. as simple or compound tax.