Slidesgo - An extensive catalog of free Google Slides themes and PowerPoint templates.
Scribd - Unlimited books, audiobooks & comics. Unparalleled discovery. Any device. $8.99/month
SlideModel.com - Create attractive presentations with our professional PowerPoint templates, slide designs, and themes. Use our PPT templates and slide designs to give unique appearance to your presentation.
Prezi - Welcome to Prezi, the presentation software that uses motion, zoom, and spatial relationships to bring your ideas to life and make you a great presenter.
SlideTeam - Transform rough sketches, notes into professional PowerPoint presentations.
Issuu - Issuu is the leading digital publishing platform delivering exceptional reading experiences of magazines, catalogs, and newspapers.