This is a copyright free/royalty free website that has a nice collection of free videos for all subject areas; these resources are appropriate for K-12. They are arranged by subject area so it makes it easy to find what you are looking for. While there are numerous free videos at your disposal, you also have the option of signing up for an account for a small yearly fee. This gives you access to even more resources such as lessons, quizzes, games, and puzzles. Also, with a subscription comes the ability to create presentations using images from their collection.
There is a wide variety of copyright free music that is free for some educational uses and some student uses as well as personal YouTube videos. However, there is a price involved with using the audio clips in other formats. You can search by music type, and then you are presented with a great selection. You can also upload a video clip and apply your audio selection to it. Another useful tool is the ability to create playlists of your favorite selections. Music can add that extra element to a presentation or lesson and this would be a wonderful site to use for that. This site could be used in any subject area and all grade levels.
This site contains copyright free/royalty free images. The small sizes (267 x 400) are free but if you'd like a larger size you will pay from $3.00 to $10.00. If you use the images, you must have an acknowledgement to FreeDigitalPhotos.net and the image creator. You can search for images by photo, illustration, or ID. You can also sign up to be a member and/or a contributor. Teachers of all content areas could find useful photos to enhance their lessons.