Open Broadcaster Software is free and open source software for video recording and live streaming. Stream to Twitch, YouTube and many other providers or record your own videos with high quality H264 / AAC encoding.
Zattoo is live TV on your PC - it's the football game as you chat, the news as you email, and your favorite soap as you pay your bills. Zattoo is also TV when you don't have a TV - it's the channels you want, when you want, where you want.
TubeTV is a freeware program for Mac OS X which enables you to search for, save, and convert YouTube and other flash videos to a format suitable for playback on your favorite devices.