JupiterInvoice - Invoices and quotes your customer can actually respond to

JupiterInvoice is the simple way to send invoices and quotes. Open the homepage, fill in the builder, send. No signup for your first one, no accounting suite to learn, no books or payroll bolted on. It also does something the others don't: the invoice is a two-way document. Your client adds their own PO number, fixes their billing entity, forwards to AP, or accepts and signs a quote right on the page, instead of over email. Free.