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Khan Academy

Thousands of videos on Math and Sciences organized by subject.

Math (2,013 videos)
Very large collection of educational videos on Math, that cover from the most basic Math fundamentals to calculus and statistics.
Science (845 videos)
A wide range of excellent videos on Physics, Chemistry, Biology, Cosmology and Health education.

Health & Medicine

References on health care.

These materials do not provide medical advice and are for informational purposes only. This content is not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read here.

MedlinePlus Medical Encyclopedia (from the U.S. National Library of Medicine and the National Institutes of Health)
More than 4,000 cross-referenced medical articles with a very comprehensive set of illustrations and photographs.

Browse by first letter of topic:

A-Ag Ah-Ap Aq-Az B-Bk Bl-Bz C-Cg Ch-Co
Cp-Cz D-Di Dj-Dz E-Ep Eq-Ez F G
H-Hf Hg-Hz I-In Io-Iz J K L-Ln
Lo-Lz M-Mf Mg-Mz N O P-Pl Pm-Pz
Q R S-Sh Si-Sp Sq-Sz T-Tn To-Tz
U V W X Y Z 0-9
Hesperian Health Guides
Easy to understand, practical, accurate and heavily illustrated guides on health topics that are very helpful for remote areas where access to medical personnel and facilities is limited.

CK-12 Textbooks

High quality and curated Textbooks collection on STEM (Science, Technology, Engineering and Math) from ck12.org.

World Literature Ebooks

Thousands of books in digital format (text) from Project Gutenberg. Organized by Bookshelves.

Various

Other valuable educational and reference resources:

OLPC Educational Packages
A collection of educational materials consolidated by the OLPC project.
UNESCO's IICBA Electronic Library
Teachers resources from the UNESCO International Institute for Capacity Building in Africa.
Math Expression
Math tutoring materials that include Math videos, Study Tips, Practice Questions and Step-by-Step solutions..

For each lesson, read the study tips carefully and take note of the important concepts/ideas before watching the video. These tips will guide you in your math thinking strategies.
PowerTyping
Full lessons and exercises to learn touch typing or improve your typing skills. Include many entertaining typing games, tests an practice drills.
Music Theory
Comprehensive music theory lessons and exercises to begin your journey into the realm of music.
MIT Scratch
Scratch is a programming language that makes it easy to create your own interactive stories, animations, games, music, and art.

As young people create and share Scratch projects, they learn important mathematical and computational ideas, while also learning to think creatively, reason systematically, and work collaboratively. Scratch is designed especially for ages 8 to 16, but is used by people of all ages.

A-Ag	Ah-Ap	Aq-Az	B-Bk	Bl-Bz	C-Cg	Ch-Co
Cp-Cz	D-Di	Dj-Dz	E-Ep	Eq-Ez	F	G
H-Hf	Hg-Hz	I-In	Io-Iz	J	K	L-Ln
Lo-Lz	M-Mf	Mg-Mz	N	O	P-Pl	Pm-Pz
Q	R	S-Sh	Si-Sp	Sq-Sz	T-Tn	To-Tz
U	V	W	X	Y	Z	0-9