DeskAlerts - Send alerts to any corporate device: PCs, phones, tablets, etc.

Dialog Messenger - handy and feature-rich enterprise multi-device messenger available for server or cloud – Slack-like, but not Slack-limited

Spectrum Chat - A newly open sourced self hosted Slack like alternative for building persistent chat communities

Ripcord - A desktop chat client for Discord and Slack

Slack - A messaging app for teams who see through the Earth!

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.