This used to be a Verizon-only thing, but now anyone with a tablet or cell phone can watch Monday Night Football on their device – for free. No ESPN / cable / satellite subscription required.
Download the app for Android here
Download the app for iOS here
Also available are the normally broadcast games on CBS / NBC / Fox. National games (SNF, TNF) are available everywhere, Sunday afternoon games are limited to wherever your device is detected being (in other words, not helpful for watching your "home team" while you’re traveling unless you’ve got a VPN based there – and even then, I haven’t confirmed that this works while using a VPN)
Preemptive plea to keep the political discussion to another forum. This is about football, people.