HAT-Matrix

HAT-Matrix.com is a new representation of an old standard--the Help Authoring Tool (HAT) Comparison Matrix that was available from helpstuff.com for five years (2001-2006). But instead of a static list, this site uses a searchable database. And instead of someone choosing the tools that are included, vendors choose whether to include their tools.

HAT-Matrix (2006). Resources>Documentation>Software>Help