$CUDADeviceCount gives the number of CUDA devices on the system.

SQLColumnNames[conn] returns a list of {table, name} pairs for each column in an SQL connection.

SQLColumnPrivileges[conn] returns a table of access rights about the columns in an SQL connection.

SQLTableExportedKeys[conn] returns a table of foreign key descriptions that reference the table's primary key.

SQLTableImportedKeys[conn] returns a table of primary key descriptions that are referenced by the table's foreign key.

SQLTableIndexInformation[conn] returns a table of indices and statistics for a table.

SQLTablePrimaryKeys[conn] returns a table of primary key descriptions.

SQLTablePrivileges[conn] returns a table of access rights about the tables in an SQL connection.

GetJVM[link] returns the JVM expression that corresponds to link, which was returned from InstallJava.

LoadedJavaClasses[] returns a list of the classes currently loaded into Java by Mathematica.