Mediocre, but I can’t find a better option
I got this program because I had too many Wikipedia tabs continually cluttering up my web browsers. Offloading these into a separate Wikipedia-reading program has been quite helpful.
As the name suggests, Wikibot is a Wikipedia reader. Don’t expect functionality beyond viewing Wikipedia articles, although, as the feature list indicates, Wikibot does this in some fancy ways. I haven’t found a similar application that comes close to Wikibot on OS X. (I’ve also tried Wikipanion Plus and Articles for the iPad, and there I think Wikipanion Plus has the edge over Wikibot.) However, images are broken under Yosemite, and there is no way to export your bookmarks. This became a problem when I switched computers; I wanted to set up the new one manually to avoid the accumulated cruft that dominated my old drive, and I couldn’t even locate the Wikibot bookmarks file. I wound up re-bookmarking everything manually.
Worringly, this application seems to have been abandoned by its developers. The company website link and the “reader support” link from the app store are both broken, the Avocado Hills Twitter feed hasn’t posted anything since May 2013, the program itself hasn’t seen an update in over a year, and Wikibot 2 is only available for the iPhone and iPad.
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Wikibot — A Wikipedia Articles Reader