Phototransistors

Ultimate GPS Breakout

Adafruit ADXL335 accelerometer breakout

Conductive Rubber Cord Stretch Sensor

DHT11 temperature-humidity sensor

High Temp Waterproof DS18B20 Digital temperature sensor

Adafruit Sensor Pack 900

Gyro Breakout Board

Adafruit BMP280 I2C or SPI Barometric Pressure & Altitude Sensor

Electret Microphone Amp

IR distance sensor with cable (10cm-80cm)