Remove paid apps

Author: mdo

site/content/docs/5.3/customize/sass.md

@@ -89,7 +89,7 @@ With that setup in place, you can begin to modify any of the Sass variables and
 
 ## Compiling
 
-In order to use your custom Sass code as CSS in the browser, you need a Sass compiler. Sass ships as a CLI package, but you can also compile it with other build tools like [Gulp](https://gulpjs.com/) or [Webpack](https://webpack.js.org/), or with a GUI application like [CodeKit](https://codekitapp.com/) or [Prepros](https://prepros.io/). Some IDEs also have Sass compilers built in or as downloadable extensions.
+In order to use your custom Sass code as CSS in the browser, you need a Sass compiler. Sass ships as a CLI package, but you can also compile it with other build tools like [Gulp](https://gulpjs.com/) or [Webpack](https://webpack.js.org/), or with a GUI applications. Some IDEs also have Sass compilers built in or as downloadable extensions.
 
 We like to use the CLI to compile our Sass, but you can use whichever method you prefer. From the command line, run the following: