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Any government site is open access, not copyrighted material. These are the sites and the index that is the most revelant to Biology.
Science.gov searches over 60 databases and over 2,200 scientific websites to provide users with access to more than 200 million pages of authoritative federal science information including research and development results.
Gemonic Science Program
The U.S. Department of Energy (DOE) Genomic Science program supports fundamental research to understand the systems biology of plants and microbes as they respond to and modify their local environments.
American Society for Microbiology
ASM Microbe brings together exceptional education into one creative learning environment.
The NatureServe Network empowers people to sustain biodiversity by making sure everyone has access to the knowledge they need to be better stewards of our shared lands and waters.
The Tree of Life Web Project
The Tree of Life Web Project (ToL) is a collaborative effort of biologists and nature enthusiasts from around the world. On more than 10,000 World Wide Web pages, the project provides information about biodiversity, the characteristics of different groups of organisms, and their evolutionary history (phylogeny).
The WWW Virtual Library: Biosciences
The WWW Virtual Library (VL) is the oldest catalogue of the Web, compiled into pages of key links for particular areas that are curated by experts of that field.
The Dryad Digital Repository is a curated resource that makes the data underlying scientific publications discoverable, freely reusable, and citable.
Archives and Repositories
bioRxiv (pronounced "bio-archive") is a free online archive and distribution service for unpublished preprints in the life sciences.
NIH Data Sharing Repositories
A summary of NIH-supported data repositories that make data accessible for reuse.
re3data.org is a global registry of research data repositories that covers research data repositories from different academic disciplines.