CompressorRater - Rate JavaScript Compression Utilities
JSMin is a conservative compressor, written several years ago by Douglas Crockford. It is considered safe (especially if you verify your code with JSLint first-- an excellent thing to do anyway) because it doesn't attempt to change any variable names.
Dojo shrinksafe is a very popular Java based JavaScript compressor that parses the JavaScript using the rhino library and crunches local variable names.
Packer by Dean Edwards, is also a very popular JavaScript compressor, that can go beyond regular compression and also add advanced on-the-fly decompression with a JavaScript runtime piece.
the YUI Compressor is a newer compressor written by Julien Lecomte, that aims to combine the safety of JSMin with the higher compression levels acheived by Dojo Shrinksafe. Like Dojo shrinksafe, it is written in Java and based on the rhino library
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