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This TCEA blog post contains station rotation models.
On Ditch That Textbook, you can find additional models for station rotation.
These EfficienTEACH Task Cards for stations include a combination of online, offline and blended activities.
Teacher Stack contains tools like the Station Rotations that will help you organize your stations to run smoothly.
While you can definitely use Flippity to help you with activities for stations, you can also use it to help with grouping students.
Classroom Screen allows you to make your stations visible and includes tools like timers and noise monitors.