Prismatic Source Excluder is a Chrome extension developed by Brendan Nee. This free program falls under the category of Browsers and specifically the subcategory of Add-ons & Tools.

If you find certain publishers appearing in your Prismatic feed that you would rather not see, the Prismatic Source Excluder is here to help. With this extension, you can specify the publishers that you never want to see and the program will remove articles from those sources as they come up in your feed.

To set up the extension, simply visit the settings page and select the publishers you wish to exclude. Make sure to use the full name of the publisher as it appears in Prismatic, such as "Mashable" or "TechCrunch".

It's important to note that this app is not affiliated with Prismatic in any way. Prismatic Source Excluder provides a convenient solution for users who want to customize their Prismatic feed by excluding specific sources.