Togetherjs - Website that helps to collaborate in real-time

TogetherJS is a JavaScript library by Mozilla that adds collaboration features and tools to your website. By adding TogetherJS to your site, your users can help each other out on a website in real time. Your users can send a unique TogetherJS url to a friend. When the friend opens the link, each user sees the same page and can interact with it together in real time.

It has support audio chat, video chat, co-browsing, Real time content sync and lot more.