Dark Mode for wp-admin (Per User)
Adds a "Dark mode" checkbox to each user's profile that switches the whole admin area to a dark look, with images and videos kept in their real colors.
Snippet Library
Admin snippets for WordPress
Snippets that tidy up and tailor the WordPress admin: hide menu items, add columns to post lists, change the footer text and remove clutter. Made for agencies and site owners who hand a dashboard over to clients or editors.
Set One Admin Color Scheme for Everyone
Applies the same admin color scheme to all users and hides the color picker on the profile screen. Handy for telling staging and production apart.