* Wikipedia (smartphone, PC): Aard Dict[1]
* Translation apps (smartphone)
* OpenStreetMap (smartphone): OsmAnd[2]
[1]: http://aarddict.org [2]: http://osmand.net
Only because people have "forgotten" how to build offline apps.
* it's nice to have knowledge at hand when offline (commuting via train, abroad w/o a local data plan, no gsm coverage, edge connection instead of 4G)
* saves bandwidth for my 1GB/month data plan when appropriate
* Aard dict can be used to evade filtering (not my primary concern, but there are people in other countries who might benefit)
* Wikipedia (smartphone, PC): Aard Dict[1]
* Translation apps (smartphone)
* OpenStreetMap (smartphone): OsmAnd[2]
[1]: http://aarddict.org [2]: http://osmand.net