Encyclopedia of subjects

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!