Offline Browser is a popular Android app that allows you to download all the web pages you need to read during the day to your mobile; then, you can browse the content when you have no WiFi or mobile connection.
XOWA is an open-source application that lets you download Wikipedia to your computer and access all of Wikipedia offline without an internet connection.
Kiwix is an open-source offline reader for online content like Wikipedia, Project Gutenberg, or TED Talks. It makes knowledge available to people with no or limited internet access.
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