Digital Voice
Setup a PI Star and DMR radio.
It took me 8 hours to work out what to do and to get it to work. I'd even bought the kit ready made but there was still a steep learning curve.
I think anyone who attempts this mode needs to get through it as a right of passage. Don't take the easy way out and just rely on someone else to solve it all. You'll thank yourself for persisting with it if you crack it by yourself.
I now play mainly on YSF/Wires-X as I lean towards buying Yeasu kit.
SSTV
Receiving images from the ISS. All good fun especially when you can just leave your radio on 2m overnight and wake up to some wonky images :)
FT8
FT8 on Raspberry PI and Mac, with a IC-705 / 991a on most bands with many thanks to Bill G4WJS (SK) for his help in getting things to work on the 991a.
Spent many hours being absolutely amazed at where 10 watts can go. I even wrote a little python script to pop all the spots on google earth. made for an amazing sight and provided useful feedback.
Packet Radio
Thanks to Tom M0LTE for setting up and running GB7RDG.
You can send me messages via Packet radio. I will ack messages sent to 2E0HFW@GB7RDG.#42.GBR.EURO