The 1.0 version of MonitorControlLite for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free Mac app is an intellectual property of MonitorControl.app. We recommend checking the downloaded files with any free antivirus.
From the developer:
MonitorControl Lite is a simplified version of the popular Mac app MonitorControl providing an even more user friendly experience. With this tool, you can easily control your display's brightness from the macOS menu bar. The utility supports smooth brightness transitions and custom keyboard shortcuts.