These are the example projects and libraries for DesignLab.
They are a separate project to make it easy to download the examples without downloading the full DesignLab source code.
To use you should go to File/Preferences in DesignLab and set the Sketchbook location to this DesignLab_Examples folder. You will also need to rename the libraries folder in your DesignLab installation to libraries-orig so you don't pick up two copies of the libraries.