Openfire - Openfire (formerly Wildfire) is a cross-platform instant messaging (IM) and groupchat server.
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.
Bopup Communication Server - Secure instant messaging (IM) and private LAN chat solutions for organizing effective real-time communication system over office LANs, business and corporate large networks, or enterprise-size WANs and VPNs
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
ejabberd SaaS - Realtime XMPP and MQTT Software and Infrastructure as a Service.
Creativity 365 - Cross-device content creation suite