Most suppliers will have their own favourites, here is a list of ones that I think if you have not got anything to look at that can handle 4+ people and are free to use. For family and friends, you may need it too
Google hangouts, as most people now have a Gmail account, they are already signed up. We use this one for our video conferencing. We find it very good for chatting. What I like is that it can run on a very wide variety of platforms. It is fairly easy to use once you get used to it. It also being actively updated.
The problems we have is that it does require a decent internet connection if you have a bad quality internet which happens a lot in Australia when the NBN goes haywire, you can be cut out.
Here are some others
To ease disruption from COVID-19, UberConference Free now allows longer call duration and up to 50 participants.
Many of the Australian schools are using it now, so many people already have it. What is really good about it is the security.
Zoom you may this one as it is now taking off because the schools are switching to it. From what we have been told its close to breaking point with now over 25 million users.