I installed the open source Cray Simulator on my "Le Potato" SBC, then installed UNICOS, then tasks Gemini with writing a weather forecasting program that ingests raw data from METAR weather stations and uses the simulator's vector processor to generate the forecast. It renders a nice little weather dashboard viewable in the terminal. A python http service runs outside the Cray and serves up a nice little web page with a virtual terminal that displays the dashboard.
Is it useful? No...but it's cool as hell. I plan to print up an enclosure for it along with a mini terminal with a 4" LCD to display the live dashboard. Then I'll have a nice little baby Cray to put on the shelf in my gameroom.
My little tribute to one of the first deployments of a Cray at NCAR.