Here at SARC, we use discord to run our server through (see link above). This allows us to concentrate meetings, RP situations and other interactions such as the economy through a single setting. Discord is available for free on PC, MAC, IOS and Android.
As a police and emergency services community, we use the free app, Zello as a police style radio. This allows us to communicate with civilians and our other units and dispatchers concurrently. It too is available for free on all devices.
Finally, we use a CAD system to allow our LEOs to search the names and statuses of civilians via a website. It allows specific CADs for 11 departments such as bail bonds etc who can look at warrants.
If you like the sound of these features hit that discord link and check us out!
SARC Operating Procedure