.  The Teensy 0.0 is now entering general release if you wanted an ARM board in a smaller package than the DUE. The Teensy is not the DUE, so be sure to understand what it offers and what it doesn't. Teensy 0.0 uses a modified Arduino 0.0.0 IDE.  The Teensy 0.0 is now entering general release if you wanted an ARM board in a smaller package than the DUE. The Teensy is not the DUE, so be sure to understand what it offers and what it doesn't. Teensy 0.0 uses a modified Arduino 0.0.0 IDE.  