Symbolab is always on the outlook to find, index and make available for search only the top publicly available scientific resources.
Some of the sources that are available to search:
- Wikipedia scientific articles
- Wikibooks
- Wikiversity
- MIT OCW (over 3000 online courses)
- Stanford SEE
- MathWorld
- ScienceWorld
- CNX
- EqWorld
- Freelance-Teacher.com
- Khan Academy
- MathOverflow
- math.StackExchange
- PatrickJMT
- Paul’s Online Notes
- PlanetMath
- And many more

Coming soon to the Scholar site:
To search on a specific source you can add the source name into your query. For instance searching for “MIT sin(x)” is searching for the equation “sin(x)” in MIT courses.
If you want us to add scientific sites that allow open free access please let us know and we will do our best to make it available on our site as soon as possible.
Cheers,
Lev