Kiwix - Kiwix enables you to have the whole Wikipedia at hand wherever you go!
Wikipedia - Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
Daily Curiosity for iOS - The top 5 things to learn on Curiosity.com, delivered daily.
XOWA - The free, open-source, offline wiki application
Inquire by Tamper - The easiest way to discover the world around you.
Aard Dictionary - Dictionary and offline Wikipedia reader.