Costa is a small and lightweight application designed to run on MS-DOS or compatible operating systems, replacing the traditional DOS prompt with a clean, user-friendly graphical interface. Developed by Jacob Palm, a Danish IT professional and hobby developer, Costa was first released in 2004 and has evolved significantly over the years. The application comes packed with useful accessories and can be used with or without a mouse, making it accessible for a wide range of users. Costa is provided free of charge, and its source code is open-sourced under the MIT license, allowing anyone to view, modify, and distribute it. The latest version, Costa 1.8.0, is available for download, with full documentation included in the package. Since September 2017, the full source code has been hosted on Codeberg, a platform for open-source projects. The website also features a blog where users can share their experiences and feedback about Costa. The application has maintained a steady development cycle, with regular updates continuing into 2025. Costa’s longevity and continued relevance highlight its value as a practical tool for users who prefer or require a DOS-based environment. The project’s open-source nature encourages community involvement and collaboration, ensuring that Costa remains a viable option for those seeking a simple, efficient interface for older operating systems. The website, which has been active since 2004, provides a comprehensive archive of all versions and changes, making it easy for users to track the application’s evolution. Costa’s success demonstrates how a niche, well-maintained project can thrive for over two decades, offering a valuable service to a dedicated user base.