Google Slides
Create presentations with Google Slides. Also lends itself to collaborative work and making ebooks.
GoConqr
A personal learning environment for students and teachers. It provides students and teachers with free applications that enhance their learning experience by allowing them create resources such as Mind Maps, Flashcards, Quizzes, Slides and Notes.
Footprints-Science
Footprints have produced quality PowerPoint slides that cover the GCSE Science requirements. A subscription service but the site includes free demonstration samples.
