Biology

A freely accessible, easy-to-search, public repository of reviewed and annotated images, videos, and animations of cells from a variety of organisms from the American Society for Cell Biology

Dedicated to the analysis of protein sequences and structures, from the Swiss Institute of Bioinformatics

A portal to cell and molecular animation

The NCBI Entrez service, a gateway to multiple life sciences collections hosted by the National Center for Biotechnology Information (NCBI), links to a large number of free databases that are invaluable free resources for various types of non-patent literature.