Hello,
Intute: Science, Engineering and Technology Quote:
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Intute: Science, Engineering and Technology offers a free, easy to use and powerful tool for discovering the best Internet resources for teaching, learning and research, covering the physical sciences, engineering, computing, geography, mathematics and environmental science
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In fact, it is a yearbook of websites. Their database contains 34449 records.
The required level may be a little high, but I think it might be quite interesting...
The database is said to be updated by universities and scientific institutions.
Enjoy.