gelf-pro
The Graylog Extended Log Format for the Node.js
gelf-stream
A stream to send JS objects to a Graylog2 server (in GELF format)
gelfling
Create and send GELF (Graylog2) messages, including chunking
winston-log2gelf
Winston GELF transport to Graylog or Gelf server via TCP or HTTP (TLS and HTTPS ready)