Keys was originally distributed by VSCO in order to give users a speed boost when editing images in Adobe Photoshop Lightroom. In August 2015, it was discontinued as a product for purchase, and is now open source and available for free download.
VSCO has open-sourced the code for the installer and Keys app. While the current layout editor has been discontinued, users can continue to edit their layouts with a text editor using resources that have been provided in the source code. For more information, view VSCO's support article or the Keys README on GitHub.