It is very common to want to use some piece of common functionality that we do not provide directly in our SDK: for instance, show the weather or swap our colors in a bitmap.
To provide this functionality, developers can create Pebble Packages, which provide developers with easy ways to share their code.
Creating Pebble Packages - How to create Pebble Packages
Using Pebble Packages - How to use Pebble Packages