The newest ESP32 can run Linux and it's getting close to a Raspberry Pi

Automated excerpt

Espressif has a new ESP32, the ESP32-S31, and that ESP32 comes with a gigabit Ethernet MAC, a USB 2. 0 High-Speed host controller, an SD card interface with two slots, and a camera input. The S31 has a USB 2. 0 High-Speed OTG controller, and it's a full-size Type-A socket that can supply 500 mA in host OTG mode. However, there's a big difference this time around.

Selected automatically from source text; not independently written or fact-checked. Read the original for full context.