Symphony OS is a Linux distribution based on Debian/KNOPPIX with a customized desktop environment called Mezzo aimed at ease of use. It provides application installation via a software store and gets system information via "desklets" on the desktop. The first alpha was released in May 2005 and development continued with subsequent alpha and beta releases, with a focus on improved stability and usability. Key features of later versions included integration with Ubuntu and a rewritten Mezzo desktop codebase.