Dialog Messenger - handy and feature-rich enterprise multi-device messenger available for server or cloud – Slack-like, but not Slack-limited
Ripcord - A desktop chat client for Discord and Slack
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.
Plumm - Single collaborative customer support dashboard for all of your projects.
Ziggs - Smoothly Share Content Between Devices!
LeggoChat - A channel or group based chat that is easily set up for casual, short, or serious discussions.