Here are some online free and open source software tools you can use to connect to eachother.
https://jitsi.org/ – video conferencing (www.vc4all.nl if you don’t run your own server yet)
https://www.mumble.com/ – voice chat
https://mattermost.com/ – team work (or sociocratic circles)
https://joinmastodon.org/ - social media
https://www.discourse.org/ - discussion platform
Running your own server(s) is more secure (for example for yorganizing your community).
