Galaxy Zoo recently migrated onto Zooniverse’s new architecture, as announced on our blog. For details, see Zooniverse's blog post here.
Galaxy Zoo is used in classrooms worldwide in a variety of ways to introduce young people and students to the amazing world of astronomy.
For a more structured introduction to Astronomy making use of Zooniverse software see the Astronomy 101 project.
We also recommend the Voyages website which provides a classroom friendly introduction to Sloan Digital Sky Survey data.