WebSlides is described as 'provides all the essentials to make beautifully HTML presentations, in the easiest way possible. Just choose a demo and customize it in minutes. 120+ slides ready to use' and is a Code Editor in the Development category. There are more than 25 alternatives to WebSlides for a variety of platforms, including Online / Web-based, Self-Hosted solutions, Mac, Windows and iPad. Most alternatives are Code Editors and Presentation Makers. The best alternative is Prezi, which is free. Other great apps like WebSlides are Reveal.js (Free, Open Source), Sozi (Free, Open Source), impress.js (Free, Open Source) and Marp (Free, Open Source).
Prezi allows anyone who can sketch an idea on a napkin to create and perform stunning non-linear presentations with relations, zooming into details, and adjusting to the time left without the need to skip slides.
The Focusky zooming presentation tool is a creative online presentation maker for Windows & Mac, presenting your multimedia presentation in dynamic and engaging way with zoom and slide effect. It is a better presentation ideas rather than PowerPoint alternative.