Mac: Microsoft Office for the Mac hasn't been fully updated since 2011, but Microsoft just put the training wheels on its preview build for Office 2016, and you can check it out for free right now.
The preview includes Word, Excel, PowerPoint, OneNote and Outlook. As you'd expect, it sports a brand new look, full-screen views, and Retina display optimisation.
Office 2016 only supports Yosemite, so you'll need to get your Mac upgraded to the newest OS if you're interested in checking it out. You can download the preview right now from Microsoft.
Office for Mac Preview [Office]