Bower
Bower is a deprecated package-manager similar to npm. It is no longer actively developed and may be discontinued in the future.
CodeKit will support Bower as long as it exists. However, you should not use it for new projects.
Enabling Bower
Open the Packages area in CodeKit. Switch to Bower by using the Registry PopUp Button shown in the sidebar when no packages are selected. Alternately, click the menu button to the right of the main search field.
Using Bower
The workflow for Bower packages is the same as that for npm, although some options are disabled because they aren't available in Bower.
For details, see the help page for npm.