StarOffice Presentation (.sdd)
The SDD file extension, standing for StarOffice Presentation, was developed by Oracle for use with StarImpress, a slide show program within the StarOffice suite. SDD files save collections of slides, typically including a title slide and supporting slides. StarOffice version 6 and later adopted the SXI format, and the current OpenOffice and Apache OpenOffice suites use ODP files for presentations.