EXIF & Metadata Viewer: Online EXIF & Metadata Viewer a tool that allows to show you hidden metadata that is embedded in that file.
FotoForensics: Submit a JPEG or PNG for forensic analysis.
Google Images: To do a reverse search, click on the small camera icon and put in an image's URL or you can paste or upload your own image.
The Hoax Photo Archive: It explores deception, mischief, and misinformation throughout history, playing host to a variety of humbugs and hoodwinks — from ancient fakery all the way up to modern schemes, dupes, and dodges that circulate online.
Image Edited?: Analyzes images to see if they are edited or photo shopped. Exif and pixel tests tell if the photo is original or modified. Exif Viewer shows the full raw exif data for your image.
ImgOps: Image operations meta-tool.
Jeffrey's Image Metadata Viewer: This tool remains available as long as the owner can keep it free and the bandwidth doesn't cost too much.
JPEGsnoop: Detailed JPEG image decoder and analysis tool. It reports all image metadata and can even help identify if an image has been edited.
TinEye: Reverse Image Search: Find other places a photo has appeared online.
Tracker: Video analysis and modeling tool.
YouTube DataViewer: Enter a YouTube URL to extract the metadata.