GCFLearnFree.org

Though there are a lot of different types of lessons on this site, the primary focus is technology. There are tutorials over every aspect of operating systems, programs and internet browsers.
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Poll Everywhere

You ask a question and students can text in an answer with their cellphones. Answers can be displayed in a variety of ways, but you need to have a projector.

Typing.com

There are a lot of typing tutorials out there, but typing.com lets you set up a class as a teacher, enroll students, and track student progress. There is also a test with a certificate generator so students have proof of progress.

Nearpod

Nearpod is like powerpoint, except students can access the slides on their own devices and you can embed questions and activities into the slides. A lot of the features are behind a paywall, but it's still very useful.