Quran By Subject categorizes the Arabic ayas or verses of the Holy Quran by subject. It has more than one hundred subjects including all the stories of the prophets in the Quran as well as very useful subjects such as.
-Creation of man and universe.
-Satan.
-Prayers or Duaa.
-Nature of man.
-Description of heaven and hell.
-Laws of Islam.
-Angels.
-God's names and attributes he describes himself with.
And many more categories.
Quran By Subject is open source as an app and as a PHP script that can be run on your own server for free.