Digital education expert Nik Peachy has compiled an annotated list of presentation tools including:

• PowerPoint
• Keynote
• Slideshare
• Simpleshow
• Prezi
• Movenote
• Authorstream
• Quickslides
• Takk
• Buncee

See also these sites describing  uses of Google Slides:

• 5 Ways to Use Google Slides in the Classroom
• 10 Google Slides activities to add awesome to classes
• 5 Unusual Ways to Use Google Presentations