Dialog Messenger - handy and feature-rich enterprise multi-device messenger available for server or cloud – Slack-like, but not Slack-limited
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Ripcord - A desktop chat client for Discord and Slack
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.
Done Hui - No need to switch between multiple pieces of software to get through the workday. CHATS: Communicate freely. CALENDAR: Know your team's availability, plan meetings. No more conflicts. TO-DOs: Stay on top of all projects. FILES: All files, one spot.
RingCentral Video - Live life unlimited. Free video meetings and team messaging in one app that works the way you do.