Zorium

Zorium is a chat app that positions itself as a go-to Discord alternative. 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 enroll in 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