Arduino shields to add wireless capability to your Arduino
Sparkfun GPS logger shield converts your Arduino board into a wonderful logger board.
Protocentral ESP8266 Wifi shield is the most suitable Wifi module for your Arduino.
Adafruit CC3000 WiFi Shield with Onboard Ceramic Antenna is a well equipped Wifi shield at a low cost.
Adafruit PN532 is a shield that is for RFID and NFC application
Adafruit CC3000 WiFi Shield is a cost effective Wifi shield for your Arduino
NFC Shield V2.0 is best suited for remote communication where there is no contact.
XBee Shield V2.0 is a shield that allows other boards to be stacked on the Arduino.
Grove XBee Carrier can be configured by an on board USB TO UART.