iOS Pick: Mevo
Leo Laporte's app cap on iOS Today 307 is the Mevo camera from Livestream. This is a small, unobtrusive camera that will stream directly to either Facebook Live or Livestream. You'll connect over Wi-Fi to the Mevo camera from an iPhone or iPad, and then you'll be able to control the camera.
The Mevo has a 4K camera, but it only streams in 1080p. The extra resolution makes it possible to use the Mevo app to zoom in and create separate shots from the wideshot, making it seem like you have a multi-camera production. It even has an autopilot mode that will detect faces in the shot and zoom in and out automatically.