4
Ribbit, audio text messaging
(www.ribbitradio.org)
Actually, EmComm, in many situations, is based on licenced software such as VARA running only on Windows with a bought key. I think it's time to try open source software.
OK, we do not speak about same users : you speak about population and I about emcomm teams. For sure, emcomm teams have to listen to population (I think about PMR446, LPD433, CB27, E channel...) in voice mode, but they need to build internal radio infrastructure to share information. Ribbit could be a brick of this solution :