LeggoChat - A channel or group based chat that is easily set up for casual, short, or serious discussions.
Dialog Messenger - handy and feature-rich enterprise multi-device messenger available for server or cloud – Slack-like, but not Slack-limited
Protonet SOUL - Protonet SOUL is social project management and collaboration for workgroup communication, file sharing, and task management.
Ripcord - A desktop chat client for Discord and Slack
Weavy - The complete white-label framework for in-app team messaging and collaboration.
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.