<div style="float: right; clear: right;">[[Special:MyLanguage/Software|Otros sistemas...]]</div>
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is an offline reader for web content. It's a software especially intended to make Wikipedia available without internet, but it is potentially suitable for all HTML content. Kiwix supports the [http://www.openzim.org ZIM format], a highly compressed open format with additional meta- data.
Kiwix is a [http://en.wikipedia.org/wiki/Free_software free software], that means you can freely copy, modify and spread it.