Twitch.tv is a live-streaming portal that primarily focuses on video gaming, but also used for many other purposes.
Metastream allows you to watch internet videos with friends. It synchronizes media on websites so you can watch together.
Open Streaming Platform (OSP) is an open-source, RTMP streamer software front-end for Arut's Nginx-RTMP Module. OSP was designed as a self-hosted alternative to services such as Twitch.tv, Ustream.tv, Mixer, and Youtube Live.
Winya is a game stream platform handcrafted by a team of mobile streamers. With Winya, you can live stream all creative content directly to Twitch, Facebook, YouTube, DLive, TikTok, yy.com or to any of your favorite platforms with RTMP from your iPhone, iPad.