If you are a student or teacher, you are likely eligible for Office 365 Education for free, which includes the full desktop version of PowerPoint [2].

You can create, edit, and share presentations without installing any software. 2. PowerPoint Mobile App

If you want a desktop experience similar to PowerPoint without the subscription, these open-source and free alternatives are excellent:

: A free, open-source desktop software that works very similarly to PowerPoint.

A design-focused presentation tool with thousands of professional templates.