Custom iOS builds of Google's Chromium WebRTC project.
You can include a pre-built version of Nighthawk via Cocoapods. Only available directly for now.
pod 'nighthawk-webrtc', :git => 'https://github.com/ceaglest/nighthawk-webrtc.git'
Patches are currently applied against Chrome 45. See working with WebRTC release branches for a primer on how to prepare your working copy.