As I started listing things down to connect with my Pi, I also realized I sometimes needed IR Sensor, sometimes a Buzzer and sometimes even a simple USART or SPI header was needed.

So, ended up with this list in the end:

Hardware (mentioned pins are BCM Pins)

OUTPUTS

• Nokia 5110/3310 LCD (RST,CE,D/C,DIN,CLK==24,8,23,10,11)
• LED (21)
• Buzzer (16 - with 2N2222)
• USB Powered Speaker

INPUTS

• TSOP17xx IR Receiver (20)
• 5x Push-to-Make Buttons (26,19,13,6,5)
• DHT11 Temperature and Humidity Sensor (17)
• DS18B20 Temperature Sensor (4)
• DS1307 RTC (SDA,SCL==2,3)
• USB WebCam

Libraries/Software Tools (used/planned to be used)

• Adafruit Nokia LCD Library
• Adafruit Python DHT Library
• Python RPI GPIO
• Wiring Pi
• LIRC

Device Tree (/boot/config.txt)

• IR Input (gpio-ir)
• DHT11
• DS1307 RTC