My district is looking for new NGSS aligned resources for Grades K-8. I am looking for any recommendations of programs for grades K-2, 3-5, and 6-8. I know there are several options out there but it would be nice to hear from some unbiased (if possible) Science teachers out there. If that's not possible, is there a neutral (if possible) organization that rates these programs/resources? Any help is greatly appreciated.