SCP Linker is a free Chrome add-on developed by vivit_jc. It falls under the category of Browsers and is listed as an Add-ons & Tools subcategory. This program aims to replace SCP numbering within a webpage with clickable links.

With SCP Linker, users can easily convert instances of "SCP-XXXX" and "SCP-XXXX-JP" within a page into actual links to their respective articles. However, it should be noted that the add-on may interfere with JavaScript-based functionalities on the page, although the developer plans to address this in future updates. To mitigate any potential disruptions, users can toggle the add-on on or off through the "Window" menu and then "Extensions".

It's important to mention that SCP Linker only supports regular SCP articles and does not provide support for articles outside of the main branch, as well as joke SCPs or articles with special numbering such as SCP-8900-EX.

Overall, SCP Linker is a useful tool for SCP enthusiasts who want a convenient way to navigate between SCP articles by simply clicking on the SCP numbers within a webpage.