FastPreview is a free graphics tool which makes it easy to view images and access their metadata from Explorer.
The program adds a preview of your image to Explorer's right-click menu, perhaps useful with a folder Details view (although of course you could open Explorer's Preview pane).
FastPreview also adds an "FP" tab to the Explorer image Properties dialog, which is then filled with every scrap of metadata it can find (Adobe eXtensible Metadata Language (XMP), Exif and IPTC tags are supported). There's so much information that finding what you need can sometimes be a problem, but when you do need the full metadata picture then it will be helpful.
You also get a simple image viewer, although this is probably the weakest part of the package. It provides right-click options to choose your preferred resampling method or display the standard Explorer context menu, but otherwise you're probably better off with the standard Windows viewer.
What's new in v4.0?
NEW: First open source release.
FIX: Fixed a scaling bug
NEW: Upgraded FreeImage3. This includes WebP support.
NEW: Upgraded build environment (MSVC12/ICC14)
NEW: Changed build to produce more optimized binaries.
NEW: Installing ProgIDs so you can easily switch to FP via Open with...
NEW: Providing Thumbnails for supported types in the Shell (Explorer, etc.)
NEW: Displaying MegaPixels (MP)