Microsoft SQL Server
Microsoft SQL Server 2005 Express Edition is a free download and also easy-to-use with a lightweight version of SQL Server 2005. It is quick & easy to learn, enabling you to immediately develop & deploy dynamic data-driven applications. SQL Server Express provides authoritative and strong data management tools along with data protection, rich features & fast performance. It is excellent for light Web apps, embedded application users & local data stores. Created for simple deployment & rapid prototyping, SQL Server Express is also available free & you are also free to redistribute it with apps. If you require more advanced database features, you can also upgrade SQL Server Express seamlessly to more modern editions of SQL Server.