VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Slidebean - Presentations that design themselves
AIMP - AIMP : Free Audio Player : Официальный сайт программы
SlidesPPT - Beautiful free presentation templates for Google Slides
foobar2000 - An advanced freeware audio player for the Windows platform.
Slides - Slides is a place for creating, presenting and sharing presentations. The Slides editor is available right in your browser. Unlike traditional presentation software, like PowerPoint, there's no need to download anything.