Download of Sprinkles 1.0 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. This free Mac application is an intellectual property of Brainbow I/S. The application lies within Developer Tools, more precisely Webmaster Tools.
From the developer:
Sprinkles is an application that lets you customize websites. Therefore, you can modify any website with simple .js or .css files. Sprinkles runs a tiny webserver on your machine. When you visit a website, the browser extension asks this server for scripts. When there's a hit, the extension adds the provided JS and CSS.
You may want to check out more Mac applications, such as Sprinkle, OpenSprinkler or OpenSprinkler Updater, which might be related to Sprinkles.