Analyze the website to determine the tools and platform used

I need to analyze the existing third-party website:
1. to determine the tools and platform they have used to get this functionality (simultaneous public live streaming and private videochat).
2. to get the approximate cost estimate and alternative solutions/tools/platforms to build a website with similar functionality

I'm not sure about the price, so I'm open to your offers!

Please, put in the heading of your bid "Streaming platform", this way I will know you read the description.