Wifi Bee-ESP8266 is a Serial-to-WIFI module using XBEE design in a compact size, compatible with XBEE slot, applicable to a variety of 3.3V single-chip system. It can be used for Arduino, wireless data transfer, remote control. On-board switch can be used to easily select the Startup module or Upgrade firmware.
ESP8266 arduino module has a powerful on-chip processing and storage capacity, built-in 32-bit processor, built-in Lwip protocol stack. Support AP+STA mode co-exist. And you could configure various parameters via AT commands.

Note: Since the STA mode which support the Server mode is not stable, we are working on that you could refer to the ESP8266 manual book to try.
 

Project 1. How to make a Heart Rate Monitor
This project makes a Heart Beat Detection and Monitoring System using Arduino that will detect the heart beat using the Pulse Sensor and will show the readings in BPM (Beats Per Minute).
Hardware needs:

• Arduino UNO Rev3
• I/O Expansion Shield for Arduino
• Heart Rate Sensor
• ESP8266 WiFi Bee

Project 2. ESP8266 Project: Desktop Weather Station With WIFI

Hardware needs:

• FireBeetle Board-ESP8266 WiFi dev board
• 2.8" USB TFT Touch Display Screen 
• 3.7V Polymer Lithium lon battery

Project 4. ESP8266 Arduino Programming Tutorial - DFRobot.com

Hardware needs:
DFRduino UNO R3
Xbee USB adapter (FTDI ready)
IO Expansion Shield for Arduino (V6)
USB Cable A-B for Arduino
Mini USB cable