Node is an event-based server-side javascript engine.

underscore is a utility-belt library for javascript that provides a lot of the functional programming support that you would expect in prototype.js (or ruby), but without extending any of the built-in javascript objects. it's the tie to go along with jquery's tux.

underscore.logger is a logging library usable either directly in web browsers or as a node module, optionally as an underscore mixin.

this package contains underscore.logger usable directly in web browsers.