Wikipedia - Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
Kiwix - Kiwix enables you to have the whole Wikipedia at hand wherever you go!
Wapedia - Education & Reference
Evopedia - Evopedia is an offline Wikipedia viewer. Features: no Internet connection needed
WikiExplorer - Download WikiExplorer for free. WikiExplorer is similar to the windowsExplorer. The filesystem is visualized within.
Aard Dictionary - Dictionary and offline Wikipedia reader.