You can download trial version of dbExpress driver for SQL Server to try using it.
Trial version of dbExpress driver is a fully functional Standard Edition, that has
the following trial limitations:
The latest version is 6.5.7 (19-Sep-2014). For a list of changes see the revision history.
Note: For the list of compatible versions please see Compatibility.
RAD Studio XE7 support in the new dbExpress drivers!
The new dbExpress drivers with support for RAD Studio XE6 are available for download now!
dbExpress drivers now support RAD Studio XE5!
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dbExpress drivers for other databases:
SQL Server data access in other technologies:
designed to aid SQL Server developers