Sandesh

Lightweight Live Ajax Search plugin enables AJAX powered live search. Lightweight and provides a shortcode to display live search input box anywhere. You can place a shortcode wherever you want. Fully optimized and easy to use plugin.
<h3>How to use?</h3>
** Replace theme’s search form **
If you want to replace them’s search form, then it is a plug and play feature.
<ol>
<li>Go to Setings->Live Search</li>
<li>Enable Replace Theme’s Search Form option</li>
<li>Select the post types you want to allow for a search</li>
<li>Save it.</li>
</ol>
All instance of your theme’s search will replace with Live Ajax Search
** Use shortcode ** 
In some cases, if you do not want to replace theme’s search form, copy the shortcode and paste it anywhere you want. You have full flexibility on it.
<ol>
<li>Go to Setings->Live Search</li>
<li>Disable Replace Theme’s Search Form option</li>
<li>Select the post types you want to allow for a search</li>
<li>Save and Then Copy the shortcode and place it anywhere you want.</li>
</ol>

Lightweight Live Ajax Search

Live Ajax based search functionality. Lightweight and provides a shortcode to display live search input box anywhere.

Ryan Edmunds

SuperLight CPT Manager is a minimalist WordPress plugin that lets administrators create Custom Post Types without clutter or bloat.
Each CPT automatically:
<ul>
<li>
Registers itself with WordPress (visible in menus and REST API)
</li>
<li>
Supports basic post features (title, editor, thumbnail, excerpt)
</li>
<li>
Comes with a unique shortcode (e.g. <code>[superlight_cpt slug="book"]</code>)
</li>
</ul>
There are no extra scripts, no custom tables, and no unnecessary settings — just pure, clean functionality in under 200 lines of PHP.
Features
<ul>
<li>
Add, import/export, or delete custom post types on the fly
</li>
<li>
Each post type gets its own shortcode
</li>
<li>
Works instantly with Query Loop and block editors (<code>show_in_rest</code> enabled)
</li>
<li>
All CPTs stored in a single WordPress option (<code>superlight_cpts</code>)
</li>
<li>
No dependencies, no setup, no nonsense
</li>
</ul>
<h3>License</h3>
This plugin is licensed under the GPLv2 or later.

SuperLight CPT Manager

Create and manage custom post types instantly. Each CPT gets its own shortcode.

Lightweight Live Ajax Search vs SuperLight CPT Manager