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GreyMatter is a blogging application released by Noah Grey in November 2000. GreyMatter is written in Perl, and requires no database because it stores content in plain files.

Other features include the ability for users to post comments to your entries, a template based system that allows you to fully customise every aspect of your site’s look and function, and support for multiple authors, with fully controllable individual access.

After February 2001, GreyMatter was no longer developed by its author, but was maintained and occasionally updated by other developers at greymatterforums.com.

In August 2006 greymatterforums.com was taken offline, but shortly after GM activity resumed based on a new website, greymatterforum.proboards82.com.

GreyMatter is open source software. You may freely modify and redistribute this program, so long as every copyright notice remains fully intact.