Admin LTE Dark by Alias LLC. is a dark skin for the most popular free admin template by Almsaeed Studio. The skin is premium and can be bought on ThemeForest.. Admin LTE is always free and open source and can be downloaded here.
Admin LTE Dark adds a dark blue tint to the entire Admin LTE theme which is by default a white color. The blue is based on the original theme's navigation bar.
To use Admin LTE Dark you must setup Admin LTE and follow the documentation to set up the skin.