Microsoft PowerPoint, Prezi, Keynote, Google Slides, reveal.js, LibreOffice - Impress, HackMD, Ludus, hovercraft, WebSlides, Marp, Slidium, Slideas, MarkDeck, Fusuma Slides, Backslide, MDX-Deck, Slide Show S9, Divshot Markdeck, Spectacle Presentation Library are some alternatives to Deckset.