Creative Commons is a tool that allows openly licensed and public domain images to be discovered and used by everyone.
Pixabay is a vibrant community of creatives, sharing copyright free images and videos.
Free Music Archive offers free downloads under Creative Commons and other licenses.
Slides Carnival provides many templates for slide presentations
Pexels provides shared free stock videos for download.
Purple Planet provides royalty free music for download.
Videvo provides free stock video and audio (music & effects).
Bensound provides royalty free music for videos.
Wikimedia Commons provides free-to-use images, sounds, videos, and other media.
TwistedWave is an online audio editor.