SQL Server 2005 Express SP3

SQL Server 2005 Express Edition is the next version of MSDE and is a free, easy-to-use, lightweight, and embeddable version of SQL Server 2005. Free to download, free to redistribute, free to embed, and easy for new developers to use immediately, SQL Server Express includes powerful features such as SQL Server Management Studio Express, for easily managing a database.

SQL Server 2005 Express