LibreOffice - Impress - Impress is a truly outstanding tool for creating effective multimedia presentations.
pdfpc - pdfpc is a presenter console with multi-monitor support for PDF files.
Keynote - Keynote for Mac, iOS, and iCloud lets you make dazzling presentations. Anyone can collaborate — even on a PC. And it’s compatible with Apple Pencil.
Impressive - latist virsion of impressive 2018 free and open source License GNU General Public License version...
Google Slides - Create a new presentation and edit it with others at the same time — from your computer, phone or tablet. Free with a Google account.
BeamerPresenter - Dual screen pdf presentation software.