Hotaru CMS is an open-source content management system designed for creating social bookmarking and content aggregation websites. It is built using PHP and MySQL, providing a flexible and customizable platform for developers and administrators to manage online communities. Hotaru CMS offers a variety of plugins and themes, allowing users to tailor the functionality and appearance of their sites. The platform emphasizes user participation and social interaction, making it suitable for sites that rely on user-generated content.