Local SHTML Processor is a free Chrome add-on developed by Joris Van den Bogaert. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. This program is designed to interpret local .shtml files and supports three directives - include, set, and echo.

With Local SHTML Processor, users can easily work with .shtml files by leveraging server-side includes. The add-on ensures that the page is loaded without SSI first, and then reloaded with the included content, eliminating the need for the page to load twice and preventing any blinking effect.

Overall, Local SHTML Processor is a useful tool for web developers and individuals working with .shtml files. It simplifies the process of interpreting these files and enhances the user experience by eliminating unnecessary page loading and blinking.