THCi - The Honest Cannabis Information Foundation  
   Some things every visitor needs to know. You don't want to accidentally eat "space cake" and coffee as just a morning snack.
   http://www.thc.nl/

Mind's High  
   Nicely designed site about knowledge and emotion in relationship to drug usage.
   http://www.xs4all.nl/~4david/

CEDRO  
   Centre for Drug Research, University of Amsterdam combines epidemiological and longitudinal research on illicit drugs, addiction theory, and drug policy developments in Europe.
   http://www.cedro-uva.org/

Trimbos-instituut  
   The Netherlands Institute of Mental Health and Addiction, aims to promote mental health in the broadest sense of the term.
   http://www.trimbos.nl/