Gasses:
MQ2 - Hydrogen, Methane, Butane, LPG, Alcohol
MQ3 - Alcohol, Ethanol, Smoke
MQ4 - Methane, LPG
MQ5 - LPG, Methane, Hydrogen, Alcohol, Carbon Monoxide
MQ6 - LPG, Methane, Hydrogen, Butane
MQ7 - Hydrogen, Carbon Monoxide
MQ8 - Hydrogen
MQ9 - Carbon Monoxide, LPG, Methane
MQ131 - Ozone, Chlorine, Nitrous Oxide
MQ135 - Benzene, Alcohol, Ammonia, Nitrous Oxide
MH-Z14A - Carbon Dioxide
GM502B - Ethanol, Formaldehyde, Methyl Benzene
ME2-O2 - Oxygen (0% - 30%)
PMS1003 - Particulate (0.3um / 0.5um / 1.0um / 2.5um / 10um count per litre)
NAP07 - Ion chamber smoke detector
SI7021 - Temperature + Humidity (0% - 80% RH +/- 3%, -10C - 85C +/- 0.4C)

Light:
APDS9960 - Ambient light + RGB + proximity + gesture
MLX90615 - Non contact surface temperature (IR)
GUVAS12 - UV (260nm - 370nm)
??? - IR
??? - Passive IR Motion
VL53L1CX - Laser Distance (20mm - 4000mm)
MAX30100 - Pulse Oximeter

Other:
AD8310 - RF Detector & Level (100kHz - 440MHz)
RF2320 - RF Detector (5MHz - 2.5GHz)
MPU9250 - Gyro + Accel + Compass
BMP280 - Pressure / Altitude
??? - Electret Mic (20Hz - 20kHz)
??? - Ultrasonic Transducer (40kHz +/- 2.5kHz)

Support:
HX711 - 24 bit ADC
AD8572 - Low noise Opamp
ADS1115 - 16 bit ADC with PGA + Mux