SlidesPPT - Beautiful free presentation templates for Google Slides
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.
Slidebean - Presentations that design themselves
Slidesgo - An extensive catalog of free Google Slides themes and PowerPoint templates.
Slides Carnival - Free quality presentation templates for Google Slides
Presentation templates by Pitch - Designed for big ideas and customizable for any story