Doaj.org: This covers free full text quality controlled scientific and scholarly journals covering wide range of subjects

xir.org: This database provides open access to more than 700,000 e-prints in physics, mathematic, computer science , quantitative biology.

wikipremend: Is a compressive open access course in College physics, chemistry, organic and biology.

Oxford Journals: Access to 228 high quality online journals in medicines , life science, mathematics, and physical science, law , humanities and social science

eurogene: It brings together top quality educational content, which allows educators to search for and assemble multi-lingual pedagogic and scientific peer-reviewed materials into customizable lecture support materials.