WArabic Ontology
WArgument map
WBabelfy
WBabelNet
WChow–Liu tree
WCognitive map
WComposite portrait
WConcept map
WConceptual graph
WConceptualization (information science)
WDogmaModeler
WDublin Core
WEnactive interfaces
WERIL
WFigurative system of human knowledge
WFrameNet
WFutures wheel
WFuzzy cognitive map
WGeneral Architecture for Text Engineering
WGroup concept mapping
WHashtag
WHistorical Thesaurus of English
WIntegrated Operations in the High North
WIshikawa diagram
WIssue tree
WIssue-based information system
WITools Resourceome
WLearning object metadata
WLibrary classification
WMedical algorithm
WMetadata
WMind map
WPersonal knowledge base
WPinakes
WPolythematic structured-subject heading system
WPretext
WRegion connection calculus
WRepertory grid
WRhetorical structure theory
WMinnie Earl Sears
WSemantic data model
WSemantic network
WTag (metadata)
WTree (data structure)
WType–token distinction
WUMBEL
WUnified Modeling Language
WUser profile
WVisual hierarchy
WWordNet