I wrote a payload controller in Go for a high altitude balloon. Like KickSat, it included a native KISS/AX.25 implementation along with an APRS library for sending and receiving most packet types. It was my very first Go project and as such, it's pretty dreadful and embarrassing to review but it did work:

https://github.com/chrissnell/GoBalloon

I even wrote a curses-based flight control console for it:

https://github.com/chrissnell/gophertrak