Socket.io - Realtime application framework (Node.JS server)
Surfly - Simple, Fast, and Secure Co-browsing
AnyDesk - AnyDesk is the world's most comfortable remote desktop application. Access all your programs, documents and files from anywhere, without having to entrust your data to a cloud service.
Samesurf - Samesurf is a patented, real time collaboration platform that enables multiple people to interact with the same online experiences in real time from any device or browser without installs or coding.
Dead Simple Screen Sharing - Simple screen sharing and audio conferencing software.
Copointer.com - Copointer is technology for co-browsing on your website, that will help to improve your customer support and to be on the same page with your client.