OLED - TeensyUser/doc GitHub Wiki

Vendor	Info
SparkFun TeensyView, fits on top of a Teensy
Adafruit OLEDS

And many more. (Google search)

Note, if you have an i2c display, you may need 2 pull-up resistors, one between pin 17 and 3.3v, and the other between pin 18 and 3.3v. Typically a 2.2K resistor is used on Teensy devices. See I2C for details