What are some alternatives?
Bitrix24 - Bitrix24 is a free (for small businesses) social enterprise platform. It is a united work space which handles the many aspects of daily operations and tasks. Create your own social intranet in minutes!
Slack - A messaging app for teams who see through the Earth!
Samepage - Easy to setup collaborative tool and file syncronization cloud application
MangoApps - Founded in 2007, MangoSpring transforms the way teams work together.
Beekeeper - The #1 All-in-One communication & productivity platform used for reaching and connecting every individual in an organization.
Huddle - Huddle | The Enterprise Content Collaboration Platform