Below are some good add-ons to help you create visually engaging slides. They provide a wide variety of pre-made templates that use to design various forms of slides. You may want to check them out and share with us your feedback.
1- Pear Deck
Provides you access to a wide variety of pre-made templates to create interactive presentations. You can add formative assessments and questions to your slides and track your students performance live.
‘Lets you to cut the clicks on repeated tasks and brings features for organizing and unifying data in Google Slides.’
3- Lucidchart Diagrams for Slides
‘Add visuals to any presentation: Spice up your slides with Lucidchart diagrams to keep your audience engaged, clarify any concept, and make your message stick. With the Lucidchart Diagrams for Google Slides add-on, instead of having to export your diagram to slides, you can insert it directly from within the Google environment. This add-on works just like our Google Sheets and Docs add-ons.’
‘Colour your slides at the click of a button! Inspiring colour palettes to save and edit or create your own. 200 palettes are preloaded and ready to use courtesy of COLOURLovers.com.’
‘Insert free, HD photos from Unsplash easily in any Slides presentation…People from around the world contribute world-class, high-resolution photos that can be used for anything for free. Unsplash photos serve as inspiration to designers, artists, writers, tastemakers, and creatives across the globe.’
‘Math Equations allows you to take your typeset languages and convert them to images to use inside of your slideshow. Other features include the ability to reload a equation image and make changes and re upload to your presentation.’