Google Docs is a free, Web-based word processor, spreadsheet, presentation, and form application offered by Google. It allows users to create and edit documents online while collaborating in real-time with other users. Google Docs combines the features of two services, Writely and Spreadsheets, which were merged into a single product on October 10, 2006. A third product for presentations, incorporating technology designed by Tonic Systems, was released on September 17, 2007.