Metastream allows you to watch internet videos with friends. It synchronizes media on websites so you can watch together. Watch or listen together: Start a session and invite your friends by sharing your friend code with them.
Watch2Gether lets groups of users watch videos in-sync together. At the same time users can communicate through a build-in chat-room and use web cam and audio chat. Available media sources are Youtube, Vimeo, Dailymotion and Soundcloud.
Kosmi is a free real time application and communication platform that offers voice, text and video calls along with games and applications such as SNES Party, NES Party, OpenArena, Poker, Virtual Cardtables, Synced YouTube and Cowatch Video.
Rave is a free iOS and Android application where you can watch Netflix, Disney+, YouTube, Prime Video and more with friends while chatting in perfect sync. Rave is also available on Chromebooks, Android TV, and is coming soon to Mac and Windows.
Web application that enables people to watch the same thing at the same time across the globe while interacting via video and text. Currently supports Netflix, Amazon, YouTube, Vimeo, Crunchyroll, etc.