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Golden - Mapping all human knowledge
Wikipedia - Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
Sutle - Save and organize resources into a directed learning path.
Kiwix - Kiwix enables you to have the whole Wikipedia at hand wherever you go!
Postly - Turn your photos into REAL beautiful postcards. Available on iPhone, iPad and Android. Make friends and family smile with a postcard!
Miraheze - Miraheze is a wiki farm (hosts wikis) for free and with no ads, it also provides custom domains...