Vibrance HDR
Create HDR image effect, from a single or multiple (AEB) photos.
...This works best in conjunction with a camera app that supports taking photos at multiple different exposures. However Vibrance HDR also supports creating a "HDR-like" effect from a single photo.
[*] Some devices support up to 7 images; others up to 3 images.
Note that Vibrance HDR is not intended to be a general purpose photo editor - there are already plenty of free apps for that.
Note that creating HDR images from multiple inputs is memory intensive, and even though Android devices may have GBs of RAM, on some devices only a fraction of that may be available for a single application to use.
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