The Raspberry Pi (or RasPi) is the workhorse of single board computers (SBCs). It is inexpensive and widely available, and well supported by the community and software maintainers alike. The Pi 3 and 4 run both 32-bit and 64-bit ARM variants of operating systems including Ubuntu GNU Linux. The Pi3 is comparable to a small cloud instance with 1GB RAM and about 1Ghz of clock speed and 4 cores; the Pi4 expands with up to 8GB or RAM, and both use under 5 watts of power--the CarPuter uses 10 watts with the 7" display and all accessories connected.

Pi3 with Camera

CarPuter