You really need to hone your searching skills. DDS tools are not hiding from you.
http://eliteforce2.filefront.com/file/DDS_Converter;29412 - DDS converter, for converting files to and from ".dds" format.
http://developer.nvidia.com/object/photoshop_dds_plugins.html - DDS plugins for Photoshop, for opening and saving ".dds" files, within the program.
http://code.google.com/p/gimp-dds/ - DDS plugins for Gimp, for opening and saving ".dds" files, within the program.