A widely used solution is to work with the Microsoft team. Entry and use is free, including video chat, file Sharing, or real-time collaboration on documents. As of today, Microsoft wants to buy the team from the free-Version of a new Feature, which is the plan for the meeting.
There are also paid versions of the Microsoft Teams, and more. Today, you should be able to use the Premium Version for up to six months, free of charge. The normal price for this is normally, it’s 10,50 Euros per user, per month.