Mod_gzip, at http://www.remotecommunications.com/apache/mod_gzip/ is a module for Apache that allows you to compress content from an Apache web server on-the-fly. It uses the same compression as gzip and no plugins or extra software is needed by your browser to take advantage of this product. Reduction in size of up to 90% or more is possible.
For: Unix, Solaris, BSD, Linux...Windows