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Web-based libre software for video chat
(lemmy.ca)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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+1 for Jitsi. Works well, user-friendly, lots of features without looking complicated, not too resource-hungry, lots of ways to extend it. All the other person needs it to click a link, enter a name and allow microphone/camera usage one time. There's also an app for Android and iOS, though you can just as well use a mobile browser.