What chat, screen share, voice call tools do companies use to communicate with customers?

I have been trying out different tools but can't seem to find one that suits all my needs.
Basil AbbasFounder and CTO, https://clockit.io · Asked
1
Google Hangouts

New web app for Google Hangouts cross-device messaging app

Miriam SchwabFounder & CEO, illuminea & Strattic · Written
Also has issues, but also free and most people have Google Accounts.
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