Several discussions at Wikimania 2015 are the genesis of this ticket. Off line editing will enable people with limited or intermittent access to the internet to contribute to wiki projects more effectively.
There are technological hurdles (which I can not articulate) having to do with edit conflicts and other stuff too.
Added mobile tag for awareness, in case resources come along.
==Bibliothèques Sans Frontières==
The French development group [[http://www.librarieswithoutborders.org/|Bibliothèques Sans Frontières]] has created the [[http://www.ideas-box.org/en/|Ideas Box]], a portable media center which, among other things, offers access to offline educational materials including Wikipedia over Wi-Fi. Up to 20 simultaneous users can upload or download content that will automatically update when the server has access to the internet.
BSF has installed Ideas Boxes in places like [[http://www.ideas-box.org/index.php/en/programs/african-great-lakes|refugee camps in Burundi]], many of which have only sporadic, low-quality internet access or none at all. Sites with sporadic access might be able to synchronize once a day; sites with none would only be able to synchronize by [[https://en.wikipedia.org/wiki/Sneakernet|sneakernet]], perhaps once a month.
BSF considers it an ethical imperative to offer Wikipedia editing alongside Wikipedia reading: "Wikipedia offline is one of the most popular resources in the Ideas Box...But it risks becoming yet another source of content created in the Global North and dumped in the Global South."
For more information about BSF's use case, you can contact Barbara Schack, director of development, at `firstname.lastname@example.org`.