ZoomIt is a Sysinternals presentation utility for zooming and drawing on the screen. It runs in the system tray and activates with customizable hotkeys to zoom in on an area of the screen, move around while zoomed, and draw on the zoomed image. It also supports snip screenshots, recording, and a break timer.
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presentationgo.com
PresentationGO offers a library of free PowerPoint templates, Google Slides themes, diagrams and infographics. The site states the designs are fully editable and available without sign-up. Templates are organized by category such as business, infographics, maps, education, medical and technology, and many are listed as available for both PowerPoint and Google Slides in 16:9 format.
slideshare.net
Searchable platform for presentations, slides, documents, and professional learning content.