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              [html]<thead><tr><td>Text2Onto, 2005, [ 1 ]</td><td>It is the reference in the field as it defines a representation - agnostic structure with modular steps and takes into account uncertainty. The system is implemented as a CATE module.</td><td>Ontologies can be exported in various formats. CATE system adds great visualisations. But it is not maintained since 2011.</td></tr></thead><tbody><tr><td>OntoCain, 2010, [ 2 ]</td><td>It focusives on multivord terms to construct a “ lexicalised contology ” by adapting an agglomerative clustering and an PCA method. It impliements & steps text preprocessing, concept extraction ( C / NC - value ). Takonomy construction, a</td><td>It considers only multiword terms and relies on WordNet and POS tags. It cloes not distinguish between terms and concepts and implements different adaptable approaches.</td></tr><tr><td>OntoLearn ( Reloaded ), 2O13, [ 3 ]</td><td>It focuses on “ lexicalised ontologies ” and uses seed knowledge. It implements 5 steps : terminology extraction. hypermym graph construction, domain filtering of hypernyms. hypernym graph pruning and edge recovery.</td><td>It relies on WordNet and PDS tags and does not distinguish between terms and concepts It implements different adaptable approaches.</td></tr></tbody>
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