
ESP8266 ESP-01S WiFi Module
ESP8266
Compact ESP8266-based WiFi dev board with 1MB flash, 2 GPIO pins, and 802.11 b/g/n. Runs Arduino, MicroPython, ESPHome, and Tasmota firmware for smart home and IoT projects.
Tensilica L106 single-core @ 80/160MHz64KB instruction RAM + 96KB data RAM1MB2 GPIOWiFi 802.11 b/g/n
~$3View

Heltec WiFi Kit 8
Development Board
ESP8266-based IoT development board by Heltec with built-in 0.91-inch OLED display, Li-Po battery management, and WiFi connectivity in a compact 50.9x18.2mm form factor.
ESP8266520 KB4 MB17 GPIOWiFi 802.11n
~$8View
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More to explore — popular traits shared by devices with CPU Architecture: Xtensa.