| Name | Grade | Content |
| Lesson Snips | K-12 | Lessons and printables |
| Homeschool Buyers Co-Op | K-12 | Lessons and printables |
| Internet4Classrooms | K-12 | Lessons and printables |
| Learning Games For Kids | K-6 | Online games |
| Discovery Education | K-12 | Virtual field trips |
| Khan Academy | K-12 | Online learning |
| PBS Learning | K-12 | Lessons and printables |
| Scholastic | K-12 | Lesson plans, printables and virtual field trips |
| eMissions.net | K-8 | Online learning, printables, virtual and science labs |
| Quizlet | K-12 | Online learning |
| Teach with Movies | K-12 | Online learning, printables |
| MrNussbaum | K-8 | Lessons, games, and printables |
| Sheppard Software | K-12 | Online games |
| moviesheets | K-12 | Teacher created movie worksheets for movies with an academic purpose |
| Annenberg Learner | K-12 | Multimedia resources for K-12 classroom instruction |
| Quizhub | K-12 | Online quizzes for many common academic topics |
| Interactive | 3-12 | Interactive, free, online courseware for exploration in science and mathematics |
| ABCya | K-6 | Online games and activities bases on Common Core standards per grade level |
| TeachersPayTeachers | K-12 | Printables |
| Crash Course | K-12 | Educational videos |
| Common Sense Media | K-12 | Lessons, games, activities |
| Unbound Ed | K-12 | ELA & Math lessons, activities, printables |
| Starfall | K-3 | Games and activities |
| K5 Learning | K-5 | Worksheets in every subject |
| Fact Monster | K-8 | Lessons, games, quizzes |
| Lakeshore Learning | K-12 | Free printable worksheets |
| Sea World San Diego | K-12 | Free activities |
| Rick Steves Classroom Europe | K-12 | European art, history and culture video clips |
| Scout University | 9-12 | Free courses for high school students |
| College Board - AP | 9-12 | AP Online Classes and Review |
| Hippocampus.org | 6-12 | Online courses & materials |
| Stanford Civic Online Reasoning | 9-12 | Lessons, assessments and collections |
| National University Virtual High School | 9-12 | Offering two FREE high school courses - all content areas (course list) |
| NationalGeo@Home | K-12 | Quizzes, videos, science experiments and at-home classroom resources |
| TEDEd | K-12 | Quality, interactive video-based lessons |
| Ken Burns in the Classroom | K-12 | Quality, historical documentary films |