Are there any teacher-led lesson marketplaces that focus on engaging classroom activities for student devices?

Yes — there are several teacher-led marketplaces and lesson-sharing platforms where teachers publish interactive classroom activities designed for student devices. A few notable ones:

• Nearpod – A teacher-created lesson marketplace focused on interactive student participation on devices. It includes slides, quizzes, polls, drawing, VR, and other engagement features.
• GoGuardian Teacher / TeacherMade – Not exactly marketplaces in the same sense, but both support device-based classroom activities and teacher-created interactive materials.
• Teachers Pay Teachers (TpT) – The biggest teacher marketplace overall. Many resources are specifically built for digital or device-based classroom use, including Google Slides, Boom Cards, and interactive lessons.
• Boom Learning / Boom Cards – Strong focus on interactive, self-paced activities for student devices; teachers create and sell card decks.
• Peardeck – More of an interactive lesson platform than a marketplace, but teachers can create and share device-based lessons; some content sharing exists through communities.
• Gimkit / Blooket / Quizizz – These are more game-based learning platforms than marketplaces, but teacher-created content and classroom engagement are central.

If you want, I can also give you:

1. a shortlist specifically for K-12 classroom use,
2. a comparison table by features, or
3. platforms that let teachers sell their own interactive lessons.