The Airplug skeleton distribution (aka the nest) contains some skeleton applications (WHA, WHO, WHE) and the LIBAPGTK library. It provides the Airplug-term mode, for prototyping using the terminal.
When it is installed, other applications (aka the chicken) can be added as well as some specific components (aka the hen) for changing the mode (eg. Airplug-emu, Airplug-live…).