What are some alternatives?
Sharepoint Online - SharePoint is a secure place to store, organize, share, and access information from almost any device.
Podio - Podio is the online work platform. Manage, share, and get your work done smarter together with tools that work like you. Free for 10 Users.
SharePoint - Share, organize, and discover information with Microsoft SharePoint. Learn about SharePoint Online, OneDrive for Business, Yammer, and Apps for SharePoint.
Huddle - Huddle | The Enterprise Content Collaboration Platform
Ryver - Ryver provides all of your team communications in one place: chats, posts, and files.
RealtimeBoard - RealtimeBoard is an online collaboration software created as a team collaboration and online brainstorming tool. It's super easy to use & free!