Kiwix allows to read websites like Wikipedia off-line. Try our 2.4MB Wikipedia demo file containing a few articles about singer Ray Charles from the English Wikipedia:
Ray-Charles-Demo.zimOffline content is available at kiwix.org or the Wikipedia bookshelf. You can create your own books in Wikipedia, refer to the help for further details.
Downloads can take a long time, go mind your regular business and come back once done.
Click the Open File button in the toolbar at the top and select the ZIM file you downloaded. That's It!
Now, enjoy your content, and take a look at the help page once bored.