Skybrud.Separator is a small package for Umbraco 8 that adds a property editor serving as a separator to give a better overview of properties within your Umbraco content types.
This package is written for Umbraco 8, and is Umbraco 7 is therefore not supported. Skybrud.Separator is however mostly based on the CM.Seperator package, which can be recommended if you're looking for an Umbraco 7 alternative.
Matryoshka is another package for the Umbraco 8 backoffice that helps organizing property groups and properties. Skybrud.Separator is tested to work alongside Matryoshka.