You don’t need to use screencasting software to narrate a Google Slides presentation. Just get the AudioPlayer for Slides extension and add existing audio or record your own. You can create one long audio track for the whole presentation, or you can break it up slide by slide. Here’s a how-to article from the extension’s creators.
Soapbox is an easy-to-use, yet robust extension that allows you to create a screencast where you share the screen with what you’re doing on your desktop. When you’re done recording, you can toggle between your image full-screen, your desktop full-screen, or a split screen. Try creating one for a project or paper introduction and keep it on your Google Classroom page for people who were absent or who want to hear the instructions again!
Take your Google Slides from blah to appealing with this nifty add on that lets you drop in icons anywhere on a slide – look how much more lively your presentations can be! Choose from hundreds of icons and customize colors, too!