CantonBolo

Features: 
1. In addition to the jQuery library, only need to load some little JS files and some little of CSS files. 
2. The output code of the plug-in on the page in line with W3C’s XHTML 1.1 and CSS 3 standards, and the code structure is very simple. 
3. When deactivated，the images calling code generated by the plug-in will not cause any adverse effects.
This plugin allows you easily to make <a href="http://flowplayer.org/tools/demos/overlay/gallery.html" rel="nofollow ugc">Overlay gallery</a> popups on WordPress.
这个插件助你在 WordPress 中轻易地使用 <a href="http://flowplayer.org/tools/demos/overlay/gallery.html" rel="nofollow ugc">Overlay gallery</a> 相册功能。
<h4>Supported Languages:</h4>
<ul>
<li>US English/en_US (default)</li>
<li>简体中文/zh_CN (translate by <a href="http://imbolo.com/" rel="nofollow ugc">bolo</a>)</li>
</ul>

Overlay4WP

Easy to use Overlay popus gallery in WordPress.Base on jQuery Library.

Harish Chouhan

Themeist Co

This plugin allows designers and developers to overlay a Figma-style layout grid on the frontend of their WordPress site to visually test alignment and spacing. It’s useful for responsive design testing and pixel-perfect comparisons to your original designs.
<ul>
<li>Enable or disable the grid overlay at any time</li>
<li>Configure separate values for Mobile, Tablet, Desktop, and Extended screens</li>
<li>Set number of columns, gutter width, and outer margin</li>
<li>Lightweight and clean — outputs only what’s needed</li>
</ul>

Grid Overlay – Figma Style Layout Grid for WordPress

Visually check if your layout matches your design by overlaying a responsive grid on the frontend — inspired by Figma’s layout grid system.

Overlay4WP vs Grid Overlay – Figma Style Layout Grid for WordPress