Slidesgo - An extensive catalog of free Google Slides themes and PowerPoint templates.
Doodly - Create your own doodle video in just 60 seconds
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.
Animaker - Animaker is an online do-it-yourself (#DIY) animation video maker that brings studio quality presentations within everyone's reach. Animated Videos, Done Right!
SlideTeam - Transform rough sketches, notes into professional PowerPoint presentations.
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.