Tradeshift is a free invoicing tool. It is web-based and works with all browsers. Simply sign on via the Tradeshift website. Tradeshift is a great alternative to creating your invoices on paper or in an office package. With Tradeshift you can connect to your business contact and build a network to allow you to exchange documents and live messages. You can add and invite business partners to join your network just as easily as you do on social networks....