For stock, royalty free, videos, sound effects, production music and AE (After Effects) templates for free, I recommend you Video Blocks, they have a 7-day free trial, and you can download up to 20 files per day. If you like the content you can subscribe after the trial period, otherwise don’t forget to cancel after the trial period or before, or you will get renewed automatically.
You can get a 90% discount using the link below:
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For free sound effects without paying a membership I recommend you this site http://www.freesound.org. Check the license on the individual files you download, some may require attribution.
Do you know any other good sites with free content? Please send us the links on the comment area below.