MOD-WIDI-ESP8266-DEV is development board with the famous ESP8266EX WIFI IC. Our module comes with 2MB (16Mb) of SPI flash memory, and all GPIO resources are available for breadboarding. The I2C and SPI interfaces are also available. It is easy to implement the module in your existing designs - you might even solder it diretly on other PCBs as it has no components on the bottom side. The module be used for home automation, smart plugs and lights, mesh networks, industrial wireless control, baby monitors, IP cameras, sensor networks, wearable wlectronics, etc.
MOD-WIFI-ESP8266-DEV is recommended for people that already have some experience with ESP8266. Consider ESP8266-EVB if you are a complete beginner.