kolakube

Sometimes you need to refresh the customizer preview, and this plugin adds a simple refresh button to make it easy.
Nothing more, nothing less.

Customizer Refresh

Add a button that refreshes the live preview in the WordPress Customizer.

Christopher Finke

Inline Preview is a plugin for WordPress that adds a live preview of the current post next to the post editor instead of opening the preview in a new tab.
Problem: When creating a post in WordPress, previewing your post in a separate tab can be slow and/or complicated.
Solution: Show the preview right next to the editor.
It’s just an idea I’m playing with for streamlining the post creation process, and if it feels familiar, it’s probably because it is: through version 2.1, WordPress contained a preview iframe at the bottom of the post editing screen, but this is a more elegant implementation.

Inline Preview

Inline Preview adds a preview of the post you're writing next to the editor when you click Preview (instead of opening it in a new tab).

Customizer Refresh vs Inline Preview