Slack - A messaging app for teams who see through the Earth!
Microsoft Teams - Microsoft Teams provides the enterprise-level security, compliance and management features you expect from Office 365, including broad support for compliance standards, and eDiscovery and legal hold for channels, chats, and files.
Blastcast - Dedicated company announcement system
Ripcord - A desktop chat client for Discord and Slack
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!
Collabe - A simple yet efficient team communication tool