What are some alternatives?
When comparing Slack Beta and Workplace by Facebook, you can also consider the following products
Slack - A messaging app for teams who see through the Earth!
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 for Mac - A new, improved Slack desktop app for Mac
Slack Video Messaging by Standuply - Easily record and send video messages in Slack 📹
Samepage - Samepage facilitates communication, project management, meetings, online collaboration, and more by combining team chat, video calling, screen sharing, task management, and real-time team document collaboration in a single collaborative workspace.
Riot.im - Open source interoperable collaboration app.