We are hosting our own Rocket.Chat instance. Rocket.Chat is similar to popular services such as Slack or Discord.
Have a look at the official user guides: https://docs.rocket.chat/docs/user-guides
Rocket.Chat provides a Desktop Application that can be used with our instance. However, the Desktop App does not have any advantage over the Browser app. Since it is an Electron app it often is even slower than the Browser app.
There are mobile apps for Android and iOS.
Rocket.Chat is integrated with out Video Conferencing solution. Click on the phone icon to start a video call in the current channel. A temporary room will be created that can be joined by clicking on the link in the chat.
Currently there are unsolved issues with the integration:
We will define a policy regarding the availablity in the chat.