A video conference tool for 100 participants in the free version and 250 participants in the paid business version. A real-time meeting tool from Google with top video and audio quality, which is also suitable for larger groups. Nice feature: Also works in the browser without installation.
A simple alternative to an online whiteboard, in which synchronous editing should be possible in real time, is Google Docs. Ideally, documents can be managed with Google Docs along with notes, spreadsheets and much more.
Instead of bilateral emails with long "cc" lists, Slack enables easy, multilateral communication for your team communication. It is easy to use and promotes distributed knowledge organization and direct, informal exchange.