4. Google Docs, 2006
Google Docs originated from two product acquisitions: Writely, a Web-based word processor; and Spreadsheets, which Google acquired from 2Web Technologies. On June 6, 2006, Google launched Google Labs Spreadsheets, the first public component of what would eventually become Google Docs.
Today, the Google Docs suite of apps includes documents, presentations, spreadsheets, forms, drawings, tables and scripts—all of which support collaboration.