Not in any particular order

• errno by rvagg

• worker-farm by rvagg

• node-timsort

• microlock

• thenby.js

thenBy is a javascript micro library that helps sorting arrays on multiple keys

• lz-string

• node-expat

You use Node.js for speed? You process XML streams? Then you want the fastest XML parser: libexpat!

• Fuse

Lightweight fuzzy-search, in JavaScript, with zero dependencies

• js ex machina

js ex machina - finite state machines in JavaScript http://machina-js.org/