ZipBooks

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ZipBooks

• ZipBooks is an online invoicing software
  application that lets you send estimates and
  invoices to you potential customers and existing
  clients. Track your time, product, and expenses
  as projects or ad hoc line items. When it is time
  to invoice clients. we auto detect unbilled
  activity and prompt you to include any or all of
  the information. Because we make money when
  client use our optional payment services,
  ZipBooks is 100 free, forever.