http://documentcloud.github.io/jammit/

Jammit is an industrial strength asset packaging library for Rails, providing both the CSS and JavaScript concatenation and compression that you'd expect, as well as YUI Compressor, Closure Compiler, and UglifyJS compatibility, ahead-of-time gzipping, built-in JavaScript template support, and optional Data-URI / MHTML image and font embedding.

Current Version: 0.6.5

貌似是@documentcloud.出品的

有用的没？