Node.js Algorithm Modules (github.com)

I've found algorithms.js to be a nice collection: https://github.com/felipernb/algorithms.js

The built in sorting algorithm (apparently it's mergesort in most browsers) in most implementations of JavaScript is often a little bit slow, so more sorting algorithms that people have implemented is a good thing. (I actually implemented Quicksort in Javascript and got about 5x better performance than Chrome's sort algorithm)

No graph algorithms yet..? That's odd.