I don't know why they don't list openSPOT on the page, but you can already connect to both DMRplus and DMR-MARC with openSPOT using the Homebrew connector in MMDVM protocol mode.
Thanks to the developer both DMRplus and DMR-MARC with openSPOT have been used and works great.
Can the code be used from the original website link.
http://dmr-marc.net/FAQ/dmrplus-america.html
Note :: The op is about the openSPOT device and listing or recognizing it's ability
not bad mouthing services or repeater owners