Biology 

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MIT OpenCourseWare for Biology
Free lecture notes, exams, and other resources from MIT courses.

Online Biology Book
Hosted by Estrella Mountain Community College. Modified lecture outlines developed by Prof Michael J. Farabee over many years of teaching college-level introductory biology.

NCBI Bookshelf
From the National Center for Biotechnology Information. A growing collection of biomedical books that can be searched directly by typing a concept into the textbox above and selecting "Go".

Bioinformatics Tutorials Series (BITS)
Developed by the MIT Engineering and Science Libraries and Harvard's Countway Library of Medicine, with instructions on using online resources such as NCBI Entrez, BLAST, and the UCSC Genome Browser

Harvard University Department of Molecular & Cellular Biology
Links to datasets, gene banks, and model organism databases, and much more.

University of Oregon Institute of Molecular Biology

University of Texas Medical Branch

EMBL - European Molecular Biology laboratory

Computational Systems Biology Lab, Department of Biology, University of Georgia