Just last week, my co-teacher introduced me to ClassTools.Net, an excellent resource for teachers! This website has interactive diagrams, models, games, and activities for all ages!
I used this site for a Hamburger Writing Model, an excellent resource for working on introductory/topic sentences, supporting details, and concluding statements! This helps the students to both plan and visualize!
There are tons of other resources as well! I definitely suggest it for teachers–super easy to integrate into the classroom, save, and work on interactively. Plus you can use technology in a simple way!