- Wikipedia The free encyclopedia that anyone can edit.
- Virtual encyclopedia Educational encyclopedia created by the Grup de Didáctica i Multimèdia from the Universitat Autònoma de Barcelona
- Virtual community of professors Community of Teachers promoted by the Grup de Didáctica i Multimèdia from the Universitat Autònoma de Barcelona
- Catalan encyclopedia
- Britannica
- Larrousse encyclopedia
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