I've just found this website that has a lot of courses in Mathematics , Computer Science , Physics ... and many other.
I hope it is useful :)
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| # | User | Rating |
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| 1 | Benq | 3792 |
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| 3 | Kevin114514 | 3611 |
| 4 | jiangly | 3583 |
| 5 | strapple | 3515 |
| 6 | tourist | 3470 |
| 7 | dXqwq | 3436 |
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| 10 | Um_nik | 3376 |
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| 5 | errorgorn | 141 |
| 6 | cry | 139 |
| 7 | Proof_by_QED | 136 |
| 8 | YuukiS | 135 |
| 9 | chromate00 | 134 |
| 9 | TheScrasse | 134 |
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it seems that some people are addicted to downvoting