Kohana was an open-source, object-oriented HMVC (Hierarchical Model View Controller) web application framework built using PHP5. It emphasized lightweight architecture and performance while adhering to PHP's object-oriented methodologies. The framework offered features like cascading file systems, community-driven modules, and easy multipurpose functionality. However, Kohana is no longer actively maintained and used to warn potential adopters to consider this in their choice of frameworks. As of the latest information, the official website, http://kohanaframework.org, may not be available, and developers are generally encouraged to look into more current and actively supported frameworks for their projects.