K-Meleon is an open-source, lightweight web browser for Microsoft Windows. K-Meleon can use the secure Goanna layout engine based on Mozilla's Gecko or the Gecko engine itself. K-Meleon was one of the first projects to use Gecko outside of Mozilla's original internet suite. K-Meleon began with the goal of being faster and lighter than the cross-platform suite of applications. It was the first stand-alone Gecko browser for Windows, predating Mozilla Firefox. It still has lower system requirements than most browsers and supports legacy systems.