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Google Play Music, a service available for people who have a Google account, lets people upload their personal music collection and access it instantly on the web or any compatible device.

ASUS WebStorage offers online storage with auto data backup for nearly 3 computers, auto data synchronization, and data sharing amongst others.

Madsonic is a web-based media streamer and jukebox fork of Subsonic Based on Java technology, Madsonic runs on most platforms, including Windows, Mac, Linux, OSX, and Unix variants.

YouTube is a global video-sharing website headquartered in San Bruno, California, United States.

Stream What You Hear (SWYH) is a Windows application to broadcast the sound of your computer (ie: “what you hear”) on an UPnP/DLNA device such as TVs, amps, network receivers, game consoles, etc...

StreamToMe is an app for Windows, Mac OSX, and iOS that lets you stream music and video files (in a wide variety of formats) live from another computer.

Watch videos streamed instantly from your computer on your iPhone, iPad, iPod touch or Apple TV.No need to worry about converting or transferring files.

AudioStreamer is a free web-based audio streamer which gives you easy access to your music. It turns your PC in a streaming webserver. So you can listen to your music from everywhere and on any device(tablet, desktop, smartphone, ...) with a webbrowser..

IMES is a server-based, multi-user music database & streamer. It employs couchdb for authentication and for serving its web frontend and music database to clients. Music is transcoded on-the-fly to MP3 and streamed via RTSP or HTTP.

A Plex client for the new Apple TV.

libresonic - Media streaming software

Emit can stream from a Windows/Mac/Linux machine to an android/iOS device. Videos are transcoded live and can be in any format. It supports subtitles (including mkv subtitles). The devices do not need to be in the same WLAN network, the streaming works over 3G as well.