Change record status: 
Project: 
Introduced in branch: 
8.x
Description: 

The following modules and themes have been removed from Drupal 8 core.

Module or theme Use instead
Blog module Use content types, fields, and the Views module (now in core) to build a blog. The legacy Blog module is also now available as a contributed project.
Dashboard module The Dashboard module is now available as a contributed project.
Design test module

The Seven Style Guide uses Lewis Nyman's tensile framework for fleshing out problems. And in D7, people seem to have coalesced around the Style Guide module.

Garland theme The Garland theme is now available as a contributed project.
Number module See Move email and number field types to \Drupal\Core\Field, remove modules.
List module See List module merged with Options module.
OpenID module The OpenID module is now available as a contributed project.
Overlay module The new Drupal 8 toolbar now includes a contextually aware "back to site" button that serves the same use-case as overlay by allowing site users to return from the admin context to the page that they were on.
PHP filter module See PHP Filter module removed from Drupal core for more information.
Poll module The Poll module is now available as a contributed project. There are also other contributed modules that provide polling functionality.
Profile module Attach fields to users or use the contrib Profile 2 module.
Trigger module The Rules contributed module provides similar functionality. The legacy Trigger module is also now available as a contributed project.

See also Modules (or Drupal 7 module-equivalent features) added to core in Drupal 8 for the modules added to Drupal 8 core.

Impacts: 
Site builders, administrators, editors
Module developers
Themers
Updates Done (doc team, etc.)
Online documentation: 
Not done
Theming guide: 
Not done
Module developer documentation: 
Not done
Examples project: 
Not done
Coder Review: 
Not done
Coder Upgrade: 
Not done
Other: 
Other updates done