Hypersay is great alternative to Fight #deathbypowerpoint. Is very easy to use, you don't need to install specific software or you don't need high performance devices.
You can upload the Powerpoint Presentation (PPT, PPTX), Google Slides and add interactive features such as polls, open questions, videos, interactive images, texts and links.
With one click and my students connected to my presentation. My students were more involved in the course and enjoyed the Hypersay features: claps, taking notes, asking questions. It's a great platform for the courses I teach.