Zorium

Zorium is a chat app that positions itself as a go-to Discord alternative. From its features, the app appears to be focused on studies and work. The project is proprietary right now, but the developer considers opening its code in the near future.

Homepage
Profile view

Zorium has a unique server type called "Academy", which allows users to discover and pick courses they want.

Regular server
Academic server

In total, there are 5 channel types on Zorium:

Text
Voice/Video
Tasks
Calendar
DMs (Preview only for now)

Text channel
Voice / Video channel
Tasks channel
Calendar channel