Screencastify is a screen capture tool available in the Chrome Webstore. There is a free version that is great to get started, but for the full features including editing you may want to purchase a full subscription for $24/year.
Closed Captions in Google Slides is available for everyone. This tool allows the spoken words of the presenter to be visible on the screen.
Doctopus is a Google Add-On that provides the ability to mass-copy (from a starter template), share, monitor student progress, and manage grading and feedback for student projects in Google Drive.
Goobric is a Chrome Extension that enables teachers to use rubrics to automatically score or grade student work.
Peardeck is an add-on for Google Slides that allows students to interact with your presentations while also capturing formative assessments as you teach.
Use the Remote for Slides extension to turn your cellphone into a clicker tool for presentations.