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A resource dedicated to establishing the field of formalised subjective effect documentation.

Encyclopedia Mythica is the premier encyclopedia on mythology, folklore, and religion. Instant mythology since 1995.

Tonalsoft Encyclopedia, Math and music, Microtonal Music Theory, Just Intonation. Math and music explain music theory based on microtonal and just intonation principles.

Erowid is a non-profit educational & harm-reduction resource with 60 thousand pages of online information about psychoactive drugs, plants, chemicals, and technologies including entheogens, psychedelics, new psychoactive substances, research chemicals, stimulants, depressants and pharmaceuticals. This includes traditional, spiritual, and responsible use, info on health, effects, experiences, images, research, chemistry, law, media coverage, bibliographies and a whole lot more.

HandWiki - Wiki Encyclopedia of Science, Technology and Computing for collaborative editing of articles dedicated to science and applications of computers, software and programming

This site contains ongoing research in the classification of occlupanids.

MEDCICLOPEDIA. Diccionario Ilustrado de Terminos Medicos. ENCICLOPEDIA de Medicina. Clasificacion Internacional de T�rminos Anat�micos. Clasificacion Internacional de las Enfermedades. CIE10 CIE-10 ICD-10. Clasificaci� Internacional de los Procedimientos. MEDICINA. Anatom�a. Gastroenterologia. Atlas de Plantas Medicinales. VADEMECUM. Neurologia. Atlas de Dermatologia, Atlas de Ginecologia

Complete contents the 1906 Jewish Encyclopedia.

KEGG (Kyoto Encyclopedia of Genes and Genomes) is a bioinformatics resource for linking genomes to life and the environment

A guide to writing systems and languages, with useful phrases, tips on learning languages, multilingual texts, and much more.

The open-access encyclopedia for topics in laser physics, laser technology, nonlinear optics, fiber optics, quantum optics, and general optics. Very useful particularly for the photonics industry and for researchers!

Explore the fact-checked online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of objective articles, biographies, videos, and images from experts.

Encyclopedia.com – Online dictionary and encyclopedia with pictures, facts, and videos. Get information and homework help with millions of articles in our FREE, online library.

The Wiki Encyclopedia for Everything, Everyone, Everywhere. Everipedia offers a space for you to dive into anything you find interesting, connect with people who share your interests, and contribute your own perspective.