The main function of the Panelizer module is to be able to attach panels to single entities. You can also allow multiple layout choices in the entity add/edit form, for example.
How to use Offsets, Reorder Columns and Nest Columns.
How to group columns with Rows and use Clearfix.
How the Bootstrap Grid System works.
How to export site variables with Strongarm module.
How to update features.
How to bundle a content type and a view together as a feature and install it to another site.
Deny and allow access based on paths/uris and ip addresses.
With this module you can grant access to unpublished nodes to anyone that has a specific URL and permissions to do so, including anonymous users.
With Access Code module you can allow visitors to log in using an access code instead of username and password.