Olivia is a blast. It’s tops for me still.
There’s new modes every year. The specs are fun to read, too, to see what people are experimenting with in terms of signal integrity, FEC, encoding... Radio is a good test bed for cutting through interference, and I know of no other field where amateurs can be a part of that sort of “bare metal” science at this scale.
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko