The BootstrapCK-Skin is a skin for CKEditor4 based on Twitter Bootstrap3 styles.
Sass is used to rewrite the editor's styles and Grunt to be able to watch, convert and minify the sass into css files. These files aren't really needed for the simple use of the skin, but handy if you want to make some adjustments to it.
For more information about skins, please check the CKEditor Skin SDK documentation.
Just skin please
Add the whole bootstrapck folder to the skin folder.
In ckeditor.js and config.js change the skin name to "bootstrapck".
Done!
The whole skin - sass - grunt package
All the sass files are included in the bootstrapck folder, so first follow the 'just skin please'-steps
Now add the Gruntfile.js and the package.json to de ckeditor folder.
npm install
grunt build
You can start tampering now.
Or if you'd like to adjust the icons, use the bootstrapck-dev folder instead.
http://kunstmaan.github.io/BootstrapCK4-Skin/
If you would like to get the Bootstrap2 skin for CKeditor3, here's the previous version.