Best tools for connecting multiple persons remotely

I have used Slack for communication purposes in my organisation. It's easy to chat with other people, easy to send code, images, audio files, etc. The best thing is the audio and screen sharing feature. It's easy to integrate zoom, calendar, and Jira app in Slack, so we can find all things is one place. We can create private and public channel for broadcasting messages. Provide notification on new message. So I can say it provides all functionality in one pack.