Impress, part of the Apache OpenOffice suite, is a presentation program similar to Microsoft PowerPoint . It does dual screen and linear presentations out of the box, but the free "Presenter Console"...
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Kova Alternatives
Kova is described as 'Markdown presentation creation tool designed to allow for rapid slide creation' and is a presentation maker in the office & productivity category. There are more than 10 alternatives to Kova for a variety of platforms, including Mac, Windows, Web-based, iPhone and iPad apps. The best Kova alternative is Canva, which is free. Other great apps like Kova are LibreOffice - Impress, Microsoft PowerPoint, Prezi and Google Slides.