Websites and posts about M17
The M17 Project
M17 Foundation wiki
M17 protocol specification
M17 on Wikipedia
M17 repeater list
Hackaday articles about M17
Have you heard of M17 protocol?
SigidWiki:M17
Hackster: M17 Project Aims to Offer Radio Hams a Fully-Open Transceiver and Protocol for Voice and Data