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by gus_massa 588 days ago
Why? Curiosity? You want to implement a universe simulator? Studding?

The list is too wide and too difficult to use without understanding them. Wolfram Alpha (as suggested by a sibling comment) is quite good and they have a lot of docs. Wikipedia can help too. There are a fwe additional sites.

But without understanding "why" it's difficult to give more personalized advice.