Collaboration:
Flipgrid( https://info.flipgrid.com/ )- Simple, free video discussions to make learning fun, fulfilling, and empowering.
Google Jamboard( https://jamboard.google.com/)- Jamboard is a digital interactive whiteboard developed by Google to work with Google Workspace
MilaNote(https://milanote.com/ )-Milanote is an easy-to-use tool to organize your ideas and projects into visual boards.
Padlet( https://padlet.com/)- Padlet enables users can upload, organize, and share content to virtual bulletin boards called "padlets.
Slack( https://slack.com/ )- Slack offers many IRC-style features, including persistent chat rooms (channels) organized by topic, private groups, and direct messaging.
Videoconferencing:
Google Meet( https://apps.google.com/meet/ )
Microsoft Teams( https://www.microsoft.com/en-us/microsoft-teams/ )
Zoom( https://zoom.us/signin )