I would like to apply lemmatization to reduce the inflectional forms of words. I know that for English language WordNet provides such a functionality, but I am also interested in applying lemmatization for Dutch, French, Spanish and Italian words. Is there any trustworthy and confirmed way to go about this? Thank you!
Try pattern library from CLIPS, they have support for German, English, Spanish, French and Italian. Just what you needed: http://www.clips.ua.ac.be/pattern
Unfortunately it only works with Python 2, no support for Python3 provided yet.