async 4,6,10,13,3,2,7,4,12

Async utilities for node and the browser

bluebird 12,1,6,9,16,15,15,5,10

Bluebird is a full featured promise library with unmatched performance.

q 6,7,6,6,15,1,8,-1,2

A tool for creating and composing asynchronous promises in JavaScript

co 0,12,9,14,11,11,7,5,8

The ultimate generator based flow-control goodness for nodejs (supports thunks, promises, etc)

when 0,0,0,1,2,3,1,1,1

A solid, fast Promises/A+ and when() implementation, plus other async goodies.

noflo 0,1,0,1,0,2,0,1,0

Flow-based programming for JavaScript

step 0,0,0,0,0,0,0,0,0

An async control-flow library that makes stepping through logic easy.

suspend 0,0,0,0,0,0,0,0,0

Callback-free control flow for Node using ES6 generators.

node-promise 0,0,0,0,0,0,0,0,0

Promise utilities for Node

pify 0,0,1,1,0,4,-1,0,0

Promisify a callback-style function

deferred 0,1,0,0,0,0,0,0,0

Modular and fast Promises implementation for JavaScript

flow-js 0,0,0,0,0,0,0,0,0

Javascript Library for Multi-step Asynchronous Logic