I have digital DMR radios. I want to link multiple sites but I don't want to use Ham servers. I want to be able to link private companies. It has to be able to pass GPS and messages. I am not worried if you use raspberry pi's or STM32's or whatever. I do want a central server to manage everything though.
This is not just a website. You need to design the hardware to receive the RF, send it over the internet to the server then re-broadcast to another digital radio. I am not too interested in the website, I am more interested in the hardware.