Wiki Offline Lite
The 1.2 version of Wiki Offline Lite for Mac is available as a free download on our website. The software is included in Education Tools. The most popular versions among the program users are 1.2 and 1.1. This free software for Mac OS X was originally created by Avocado Hills, Inc. The bundle id for this app is com.avocadohills.wikiliteosx. The latest version of the program can be downloaded for Mac OS X 10.6.6 or later.
From the developer:
Wikipedia Offline delivers the premium reading experience for the entire corpus of human knowledge.
You may want to check out more Mac applications, such as Wiki Offline — A Wikipedia Experience, Wiki Offline - 80+ Languages of Wikipedia or Zim-Wiki, which might be similar to Wiki Offline Lite.