Brand: Raspberry Pi Foundation
Functions: Astrophotography automation (Stellarmate using EKOS, KStars and Indi drivers)
Bus communication: USB, I²C
Comments: Very common hardware for astrophography setups using EKOS.
Brands: Original Arduino, Joy-IT
Functions: Roof controller, Dust cover & flat field
Bus communication: I²C
Comments: More robust than expected, even at subzero temperatures
Brand: CGE Electronics
Functions: First level observatory automation (Remote power switch, rain, temperature, humidity, redundant roof control)
Bus communication: Ethernet and EBX
Comments: Very reliable even at subzero temperatures, intuitive programming interface (maybe not made for complex codes)