ARDUIO

http://www.arduino.cc/
https://www.sparkfun.com/search/results?term=gas+sensor

2.4Ghz

https://arduino-info.wikispaces.com/Nrf24L01-Info
http://www.nordicsemi.com/eng/Products/2.4GHz-RF/nRF24L01P
http://arduino.cc/forum/index.php/topic,62222.0.html
http://maniacbug.github.com/RF24/index.html

GSM

https://www.circuitsathome.com/mcu/programming/interfacing-arduino-to-a-cellular-phone

SENSORS

http://www.instructables.com/id/Use-your-android-phone-sensors-on-the-arduino-/

Temperature http://playground.arduino.cc/Learning/OneWire

gyro: http://playground.arduino.cc/Main/MPU-6050

     http://www.invensense.com/mems/gyro/mpu6050.html

Linux

https://wiki.archlinux.org/index.php/arduino

Bluetooth:

http://homepages.ihug.com.au/~npyner/Arduino/GUIDE_2BT.pdf

433

http://code.google.com/p/rc-switch/
http://www.wes.id.au/2013/07/decoding-and-sending-433mhz-rf-codes-with-arduino-and-rc-switch/

   https://code.google.com/p/rc-switch/

IR

http://playground.arduino.cc/Main/IRLib
http://arduino-info.wikispaces.com/IR-RemoteControl

Time

http://playground.arduino.cc/Code/Time#.UzVmHqYX5CM
http://arduino.cc/en/Tutorial/UdpNtpClient
NTP server

power save

http://playground.arduino.cc/Learning/arduinoSleepCode#.UzVn06YX5CM

AIS

http://www.oz9aec.net/index.php/gnu-radio-blog/482-a-2-channel-ais-receiver-using-rtl-sdr-and-gnuais
http://gnuais.sourceforge.net/