YouLess 2.1.5 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The actual developer of this free software for Mac is PostFossil B.V.
From the developer:
YouLess is a powermeter that displays the current energy usage collected by the YouLess LS100 or YouLess LS110. The tool collects the electricity usage in your household by reading the main electricity meter. The data is being stored on the YouLess and, if desired, it can also be sent to an internet service for visualization and analysis purposes.