Add a field whose value is calculated using raw PHP; specifically $value = 'foo';
(The recommendation is you write your PHP in a module of your own, and then call that method from the UI - for security and version control reasons).
Note: value is only calculated when nodes are saved (i.e. will initially be empty for existing content).
D8 status; alpha but working.
Store a pair of fields together (numbers and text, boolean, email, telephone, Url). As normal you can specify the quantity of double fields per entity, or allow an unlimited number.
Note: D7 version doesn't support 'date'.
Don't use it for:
(based on ffc which hasn't been ported to D8).
Allows you to configure field display based on value. Adds a 'Conditions' pane to the cog in Manager Display of all entities (so content types but also comment types, e.g. if you have comments with multiple fields)
Requires Display Suite (ds)
Note: if you wanted to hide say a checkbox when it's value is false - you can do in it core with Manage Display - turn the label off then set (via cog wheel) the output format to Custom, and you can enter a value for true and leave false blank - exactly the same widget for boolean values you use when setting the output of a field in a view.
Add group' button to /admin/config/people/accounts/form-display (or any other form), can then group fields inside fieldset/other HTML wrappers.
Types of groups:
In theory can use this to add <div>s with css styles such as flexbox, like webform uses, but CSS to support that needs to be present on the page.
Control which text formats are available per field. (Often you'll want some fields to be simpler than others - e.g. you might want restrict everyone to a single format so they don't see a dropdown menu.
You can hide the 'About text formats' link and the list of available HTML tags, again per field, in the Form Display tab using the widget icon.
For those familiar with WordPress, this is the equivalent of the ACF repeater field. You can create paragraph types, which are collections of one or more fields, and the user can add as many of them as they like. So you could have distinct paragraph styles, e.g. with images aligned in a certain way, or a page consisting of parallax backgrounds etc.
Handle favourites, reading lists, spam, friend lists etc. Can be applied to any entity (nodes, users, comments etc.) It appears as a clickable link. Can choose between page reload and AJAX when user toggles it. Linked with views, and you can trigger events when flag count reaches a threshold.
Provides: