QEMU version 9.0.0 will delight Raspberry Pi fans. There is SPI and I²C support for older models, and an almost complete Raspberry Pi 4B can be emulated.

PiPower 3, a robust Raspberry Pi UPS module offering superior power management, intelligent monitoring, and enhanced compatibility for ...

Witty Pi 3 Mini supports all Raspberry Pi models that have the 40-pin GPIO header, including A+, B+, 2B, Zero, Zero W, 3B, 3B+, 3A+, and 4 B+. Watch this video on YouTube.