Slidebean - Presentations that design themselves
Slidesgo - An extensive catalog of free Google Slides themes and PowerPoint templates.
Microsoft PowerPoint - Microsoft PowerPoint empowers you to create clean slideshow presentations and intricate pitch decks and gives you a powerful presentation maker to tell your story.
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.
Genially - The largest community of interactive content creators. We want interactive content to be the new standard. Our content formats aren't just presentations or infographics; they're geniallys.
Slides Carnival - Free quality presentation templates for Google Slides