For some of our projects, you will also need MixedRealityToolkit for Unity (formerly called HoloToolkit) from Microsoft. This is a package of additional utility scripts that facilitate HoloLens development in Unity. It can be found at https://github.com/Microsoft/MixedRealityToolkit-Unity.
Download the latest version from the Releases folder (https://github.com/Microsoft/MixedRealityToolkit-Unity/releases) and keep it where you can find it again when you need it.
Learn more about these awesome components at https://github.com/Microsoft/MixedRealityToolkit-Unity/wiki.