James Gaskin

LibreOffice is a full-featured, free office suite that's so similar to Microsoft Office that 95 percent of users could switch and never look back.

Ninety-five percent of Microsoft Office users could switch to the free OpenOffice without missing a beat.

Google's browser-based office suite has a dead-simple interface, along with the best collaboration and synchronization features on the market.

WordPerfect offers the most powerful productivity applications, but it doesn't play well with Office 365 or offer cloud collaborations.