pxt-calliope/docs/open-source.md

# Open Source

The editor is open source on GitHub under the MIT license. Contributions are welcome, please check our GitHub repos.

## Source Code

* [microsoft/pxt-microbit](https://github.com/Microsoft/pxt-microbit), PXT target for BBC micro:bit, also includes the documentation.
* [microbit/pxt](https://github.com/Microsoft/pxt), programming experience toolkit (PXT)
* [microsoft/pxt-microbit-core](https://github.com/Microsoft/pxt-microbit-core), Yotta module used to build the BBC micro:bit runtime

## C++ Runtime

The [C++ micro:bit runtime](http://lancaster-university.github.io/microbit-docs/), created at [Lancaster University](http://www.lancaster.ac.uk/), provides access to the hardware functions of the micro:bit, 
as well as a set of helper functions (such as displaying a number/image/string on the LED screen). 

## Extensions

* [microsoft/pxt-neopixel](https://github.com/microsoft/pxt-neopixel), extension for neopixel strips
* [microsoft/pxt-filesystem](https://github.com/microsoft/pxt-filesystem), extension for the file system
* [microsoft/pxt-max6675](https://github.com/microsoft/pxt-max6675), extension for Temperature Probe (MAX6675)