I can recommend Cisco WebEx. But it dosn’t have the function to create polls or have the really nice feature of Q&A section. It’s more a meeting provider than a conference tool.
You only pay based on the WebEx hosts you have registered and it have the option to call per phone as well using headphones. It comes along with an desktop app, supports direct browser connection and have also apps for cell phones.
At the moment you can try it 4 months for free.
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