You can add students to a Google Classroom by sending an email or by sharing an invite link or class code.

Rebecca Torchia is a web editor for EdTech: Focus on K–12. Previously, she has produced podcasts and written for several publications in Maryland, Washington, D.C., and her hometown of Pittsburgh.

But for 2021, when Class Central founder Dhawal Shah emailed me a heads-up that his company’s latest list was out, I was shocked when I clicked over. This year’s edition looks exclusively at newly ...