NewSoftSerial an improved version of the SoftwareSerial library. PS2Keyboard PS2Keyboard allows you to use a keyboard for user input. SSoftware2Mobile An Arduino libary to allow SMS and emailing via mobile phone. webduino Simple and extensible web server for Arduino and Ethernet Shield. X10 This library enables you to send and receive X10 commands from an Arduino module. X10 is a synchronous serial protocol that travels over AC power lines, sending a bit every time the AC power crosses zero volts. xbee-arduino This is an Arduino library for communicating with XBees in API mode, with support for both Series 1 (802.15.4) and Series 2 (ZB Pro/ZNet). Capacitive Sensing The capSense library turns two or more Arduino pins into a capacitive sensor, which can sense the electrical capacitance of the human body. Bounce Bounce is a library for Arduino (arduino.cc). It debounces digital inputs and more. Time The Time library adds timekeeping functionality to Arduino with or without external timekeeping hardware. Metro It facilitates the implementation of recurring timed events like: -blinking LEDs -servo motor control -Serial communication Streaming Streaming C++-style Output with Operator << Button It is created to help Hardware Abstraction, and readability of code. It hides the pinMode, and digitalRead calls for the user. Keypad The Keypad library allows your Arduino to read a matrix type keypad LED Potentiometer SevenSegment ShiftRegister Summer Array AverageList Charlieplex Constrain a simple struct that has constraints that will persist. EEPROMVar Finite State Machine A FSM serves as a manager that organizes a set of states, or behaviours. It manages the transition between states, and the state itself. HashMap Menu Provide an easy way of making menus Password SerialDebugger TimedAction Scheduler EasyTransfer The purpose of this library is to make it easy for the everyday Arduino user working on projects with multiple Arduinos communicating with each other and sharing data. TLC5940 TLC5940 library by Alex Leone as found here: http://code.google.com/p/tlc5940arduino Release r014_2 AnalogDebounce Debounce voltage divided keypads that use a single Analog Input. Most up to date version always available at https://github.com/MatCat/AnalogDebounce