Neo

Neo is a field type that builds upon the concept of the Matrix field type with a number of very useful features. Neo has been carefully crafted (pun intended) to ensure it matches the look and feel of Craft.

Block types have the ability to contain child block types. You can filter what block types are allowed as children of others, as well as set whether a block type is not allowed at the top level of the Neo field and can only be a child. Block types can also be grouped, which allows you to organise your block types into drop down menus.

See the Neo repository on GitHub for more information.