Streams3, a user-land copy of the stream library from Node.js
Full featured Promises/A+ implementation with exceptionally good performance
YAML 1.2 parser and serializer
A library for promises (CommonJS/Promises/A,B,D)
The official MongoDB driver for Node.js
Simple to use, blazing fast and thoroughly tested websocket client and server for Node.js
Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.