Do I need a paid account to use the Zoom plugin? Will it work on the Basic version for free?
Hi @madek, here are the docs for Zoom plugin: https://github.com/mattermost/mattermost-plugin-zoom/blob/master/README.md#zoom-setup-guide. You will need a paid Zoom account to use the plugin.
Is Jitisi a free alternative?
Here is a link to a documentation with a full list of voice, video and screen-sharing options for Mattermost: https://docs.mattermost.com/deployment/video-and-audio-calling.html.
I believe Jitsi is free.
it is free and open-source but I missing some explanation on how to deploy, see Jitsi (Plugin) within Mattermost
You might want to try BigBlueButton as well. There is a blog post from Mattermost about it here : https://mattermost.com/blog/bigbluebutton-integration. If you’re interested in trying it out you can also head to the Github page for instructions on how to setup and integrate them : https://github.com/blindsidenetworks/mattermost-plugin-bigbluebutton#installation-and-setup