Roland VR-1HD AV Mixer

Roland's VR-1HD AV Mixer is a great solution for live streaming three HD cameras and two microphones. It is great for home use but could also be used for live streaming events providing that you can either manage with just two microphones (or bring an audio feed in from another source). 

Roland says:

If you’re a content creator seeking maximum engagement, livestreaming outperforms uploaded video by a significant margin; audiences are larger, watch for longer and post more comments. Roland’s VR-1HD lets you broadcast dynamic multi-camera livestreams, complete with amazing picture and sound that easily outshines ‘standard’ livestreams from a mobile phone or static webcam. Whether you’re a creator, gamer, commentator or presenter, it’s the easy way to livestream with high production standards. And since you’re going to get more comments, ensure they’re good ones with the VR-1HD.