ESP8266 WiFi Module acts an interface between the microcontroller board and your Wifi network.
2.4GHz Dipole Swivel Antenna with RP-SMA - 5dBi is found in wifi devices.
2.4GHz Dipole Swivel Antenna with RP-SMA - 2dBi will help in enabling wireless communication in your project
Adafruit CC3000 WiFi Shield with Onboard Ceramic Antenna is a well equipped Wifi shield at a low cost.
Adafruit CC3000 WiFi Shield is a cost effective Wifi shield for your Arduino
WiFi Bee is a wifi transceiver compatible with the XBee Pro.