Is there an online directory of algorithms and their implementations in different languages?

Question

For example, on such a site, you could look up Quicksort and get a listing of (user-contributed) Quicksort implementations in C, Java, OCaml, etc. I believe this service already exists but I can't find it.

Answer 1

http://rosettacode.org/wiki/Welcome_to_Rosetta_Code ?

Answer 2

pleac contains a lot of solutions to common programming problems, mainly for so called scipting languages.

Answer 3

Nist , Dictionary of Algorithms and Data Structures

Answer 4

In a different vein, http://benchmarksgame.alioth.debian.org/ contains lots of highly optimized implementations of many tasks in many languages, a number of which happen to be closely tied to well-known algorithms.