What are some alternatives?
When comparing Kahootz and Sharepoint Online, you can also consider the following products
Collavate - Collavate is a collaborative workflow and document management suite that runs on Google Drive.
MS SharePoint - Share, organize, and discover information with Microsoft SharePoint. Learn about SharePoint Online, OneDrive for Business, and Apps for SharePoint
Scalix - Scalix provides email, group calendaring and other collaborative software that enables users to reduce cost of ownership.
Ryver - Ryver provides all of your team communications in one place: chats, posts, and files.
Amazon WorkSpaces - Amazon WorkSpaces is a managed desktop computing service in the cloud.
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.