First off, if you aren’t using Google Chrome, you really should be and you should go here right now and download it.
Then, this plugin for Chrome, released by Google, allows you to edit your Microsoft Word, Excel and PowerPoint files using the Google Apps editor right in Chrome. The kicker is: you can use it with or without Google drive, and edit online and offline files.
After you install the plugin, you can set the file associations in Windows or OSX to open the office document types with Chrome and POOF! Free office editing.
Obviously it’s not as full featured as the full Microsoft Office products but great in a pinch and has all the things most users need. And my favorite part – no RIBBON, Google’s editor has good old fashioned drop-down menus.