Sites that I can't do without as a math teacher (and what's so special about each one!) Links to virtual manipulatives, discovery-based lessons, free graphing software, question prompts, eBooks, and more.... Tons of resources for math teachers
I love this ecosystem interactive notebook for my students. It contains food webs, food chains, energy pyramids, and more. Part of the Earth Science interactive notebook series. Great interactive journal projects for 4th grade - middle school.