A list of the 13 libraries in the architecture teensy.

Adafruit SleepyDog Library Arduino library to use the watchdog timer for system reset and low power sleep.
Blynk_Teensy Enable Blynk support of Teensy boards, especially latest Teensy 4.0, using WiFi, Ethernet, BT/BLE and GMSM/GPRS shields
FirebaseJson The easiest Arduino library JSON parser, builder and editor for ESP8266, ESP32, Teensy 3.x, Teensy 4.x and others MCUs.
GUIslice GUIslice embedded touchscreen GUI library in C for Arduino & Raspberry Pi
Hello Drum Arduino Library for piezo sensing
Lepton FLiR Thermal Camera Module Library Library to control a Lepton FLiR (forward looking infrared) thermal camera module from an Arduino-like board (Teensy 3+/ESP32+ minimum).
Mcp3208 Arduino library for the MCP320x 12 bit ADC family.
MFRC522 Arduino RFID Library for MFRC522 (SPI)
MFRC522-spi-i2c-uart-async Arduino RFID Library for MFRC522 (SPI, I2C and UART) with asynchroneous callbacks
PJON PJON is an open-source, multi-master, multi-media bus network protocol
Teensy_TimerInterrupt This library enables you to use Interrupt from Hardware Timers on a Teensy-based board such as Teensy 4.x, 3.x, LC, 2.0, etc.
TimerInterrupt This library enables you to use Interrupt from Hardware Timers on an Arduino, Adafruit or Sparkfun AVR board, such as Nano, UNO, Mega, Leonardo, YUN, Teensy, Feather_32u4, Feather_328P, Pro Micro, etc.
Watchdog Watchdog resets the device if the timer expires before the watchdog is reset.