Extension: Google Meet Grid View (https://bit.ly/googlemeetgridview)
Many teachers have requested to be able to have all of the participants of a Google Meet in a grid view to see who is participating. Although this extension is not from Google, I have installed this extension and used it, and it works well! You will see a grid in the upper right hand corner of a Meet that you can turn on or off when you would like to add the grid. (GRID VIEW IS NO LONGER NEEDED SINCE MEET HAS UPDATED ITS LAYOUTS!)
Extension: Meet Attendance (bit.ly/meetattendance)
Collect attendance in a Google Sheet from a Google Meet. When in Meet select the extension Icon. Click the plus button to create a Google Sheet to take attendance in. When in a Meet click People and attendance will automatically be taken and placed in the Spreadsheet. See more detailed instructions here.