Google's Pixel smartphones have gotten a lot of praise for its photos. For those without a Pixel smartphone, you can at least try out the Pixel smartphone app - said to be one of the better photography apps on Android.
A developer only known as B-S-G has released a download that can work on phones powered by the Snapdragon 820, 821 and 835.
It's basically a modified version of Google Camera 4.4012.156195200 and you'll get a chance to try out the HDR+ feature enabled with the app.
You can download the app here, but do note that you will have to sideload the app as it is not available on the Google Play store officially. While the file has been deemed safe, with no malware or dangerous software on it, there's nothing wrong with being careful and scanning the app with antivirus once you do download it.