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I really don't understand what is the point of such entries. Everybody knows stack overflow. Putting a link to a tag on SO is not really something worth sharing.

Well, it's a weekend. Sharing this might lead some HNers spend some time going through the list of algorithms (which I thought is good; a refresher may be)which might be spent elsewhere. That's the intent.

There is also the NIST's Dictionary of Algorithms & Data Structures, which is formatted a little nicer. These are mostly 'textbook' algorithms though, probably not as specific as most of whats on StackOverflow

http://xlinux.nist.gov/dads/

The Stony Brook Algorithm Repository is a nice little collection of algorithms, plus they out link to various implementations:

http://www.cs.sunysb.edu/~algorith/

Was this supposed to link to the tag algorithms or to a particular question?

It was link to the 'algorithm' tag.

Good collection of Algorithms