| Wikipedia | All the world's knowledge |
| Wikidata | The database of structured information |
| Wikimedia Commons | The world’s largest free-to-use-library of illustrations, photos, drawings, videos and music. |
| Wikibooks | Collection of free e-book resources (textboosk, annotated texts, instructional guides, manuals) |
| Wiktionary | A dictionary for over 170 languages which aims to describe all words of all languages |
| Wikiquote | A collection of sourced quotations from notable people and creative works in 75 languages |
| Wikisource | |
| Wikiversity | |
| Wikispecies | A taxonomy-database that covers living and fossil representatives of Animalia, Plantae, Fungi, Bacteria, Archaea, Protista etc. |
| Wikistats | |
| Wikitech | Technical documentation of the Wikimedia Foundation infrastructure and services. |
| Wiki Replicas | |
| Wikimedia Cloud Services (WMCS) | Tools, services and support for technical collaborators of Wikimeda software projects. |