PsychonautWiki is a community-driven online encyclopedia that aims to document the field of psychonautics (i.e. the exploration of altered states of consciousness) in a comprehensive and scientifically-grounded manner. Our documentation includes an extensive content collection covering the scientific research and harm reduction practices relevant to hallucinogen and general psychoactive substance experimentation as well as other methods of exploring consciousness such as meditation, lucid dreaming, and sensory deprivation. This information is presented alongside an integrated descriptive subjective effects index which is designed to facilitate analysis and sharing of non-ordinary states of consciousness via easily readable terminologies, descriptions, leveling systems, and example images (replications).