What are some alternatives?
When comparing Kahootz and Ryver, you can also consider the following products
Collavate - Collavate is a collaborative workflow and document management suite that runs on Google Drive.
Slack - A messaging app for teams who see through the Earth!
Scalix - Scalix provides email, group calendaring and other collaborative software that enables users to reduce cost of ownership.
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.
Amazon WorkSpaces - Amazon WorkSpaces is a managed desktop computing service in the cloud.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.