As of April 12, 2016, SQL Server 2005 is no longer supported by Microsoft. This means there will be no more bug fixes, no more service packs, no more hot fixes, and not more security patches.
SQL Server 2005 had a run of nearly 11 years being supported, and it has been retired.
Any SQL Servers running SQL Server 2005 should be migrated to a newer version of SQL Server. The only exception would be vendors who have products that only work with SQL Server 2005, in which case you may want to consider switching vendors. That may sound a bit harsh, but anyone who is making a product that only runs on SQL Server 2005 is probably not very up to date on their security patches or other fixes.
If you need help migrating from SQL Server 2005 to a newer version of SQL Server, Stedman Solutions, LLC can help.