Four Encyclopedia tools in One App. It contains:

Wikipedia the Free Encyclopedia.

Encyclopedia of Philosophy. Everything you want to know and search about philosophy with the Stanford Encyclopedia of Philosophy.

Medical Encyclopedia. If you are searching for medical information then this tool is for you. Thousands of articles about health and medical science.

The World Digital Library: It provides free access to manuscripts, rare books, maps, photographs, and other important cultural documents from all countries and cultures, in Arabic, Chinese, English, French, Portuguese, Russian and Spanish.

This is an excellent tool for Teachers and Students and we could say that is an app useful for everyone.