lepo.co

The dark editor of plugins and themes will let your eyes rest. Comfortable, material design will facilitate your workflow.

Dark Editor – Themes & Plugins Editor

A dark theme for editing plugins and themes.

Nicolas Notararigo

It’s not a simple plugin, it’s a complete style of Admin Panel in Dark Mode. 
This plugin transform your WP Admin in DarkMode. Install just plugin and activate it to see dark mode !

DarkPress

I like the concept (very nice if you manage different WP installations, you know where you are at a glimpse with admin schemes) and it’s efficient. But not perfect for the moment (I dont like the effect of pink buttons).

Dark site of Admin

It's a simple plugin to modify your WordPress admin interface in DarkMode

Dark Editor – Themes & Plugins Editor vs DarkPress