RevEye Reverse Image Search searches Google, Bing, Yandex, TinEye, and Baidu
Google Reverse Image Search, images.google.com (also available as Chrome and Firefox add-on), you can also right-click on the image.
INVID Verification Plugin download chrome ext put a link to a video in INVID, analyze thumbnails via TinEye, Yandex or Google reverse image search
Watchframebyframe.com watch youtube and Vimeo videos frame by frame
Dual Maps mashup of synchronized Google Maps, Aerial Imagery and Google Street View
Image Verification Assistant “features a multitude of image tampering detection algorithms plus metadata analysis, GPS Geolocation, EXIF Thumbnail extraction, and integration with reverse image search via Google.”
Crop and Search technique from Peter Adams at News Literacy Project
Storyful Video Archive search for verified user-generated videos by topic or keyword. You can search, but you have to pay to use the content.
Google Fact Check Explorer search engine checks all major fact-checking sites
Coronavirus Disinformation Database, Poynter
NewsGuard Chrome Extension “trained analysts, who are experienced journalists, research online news brands to help readers and viewers know which ones are trustworthy--and which ones aren't."