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. This premiere service is the result of collaboration with over 1000 users just like you. Join the myriad of scientists, teachers, frequent flyers, vacationers, parents, and knowledge lovers whose lives have been improved by Wiki Offline.
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.