proxy-from-env
Offers getProxyForUrl to get the proxy URL for a URL, respecting the *_PROXY (e.g. HTTP_PROXY) and NO_PROXY environment variables.
proxy-cmd
Toggle proxy environments (http_proxy and https_proxy) in command line.
shadowsocks-js
Yet another shadowsocks implementation for nodejs to help you bypass firewalls.
auto-http-agent
Create http agent for HTTP(S)_PROXY proxies and/or keepAlive