makenmarketing

This plugin allows you to designate certain products in your WooCommerce store to have no price. Instead, it displays a configurable button for customers to request a quote directly via a chat app (like WhatsApp).
From the settings page, you can customize: 
* The WhatsApp phone number. 
* The button text and icon. 
* The predefined message the customer will send. 
* The button colors.

Quote via Chat Button

Replaces the "Add to Cart" button with a chat button for products without a price, with customization options.

Atawai

This plugin addon for Elementor Website Builder it mean you need install <a href="https://wordpress.org/plugins/elementor/" rel="ugc">Elementor</a> plugin and activate before.
<h3>Widgets</h3>
The plugin offers inbuilt widgets that help to create design more attractive.
<ul>
<li>Slideshow – Slideshow based <a href="https://github.com/nicinabox/superslides" rel="nofollow ugc">Superslides</a> engine with part: heading, subheading, text and two action buttons.</li>
<li>Gum Heading – Three colors heading with line and image decoration.</li>
<li>Pricing Table – Pricing table with two pricing systems.</li>
<li>Recent Post – Show recent post list.</li>
<li>Blog Grid – Show blog post ( including pagination ).</li>
<li>Blog Term – Show blog term list ( tag, categories ).</li>
<li>Post Meta – Show sortable post meta for single post.</li>
<li>Post Term – Show sortable post term and divider for single post.</li>
<li>Post Related – Show related post for single post.</li>
<li>Post Adjacent – Show previous/next post for single post.</li>
<li>Post Share – Share post to social media.</li>
<li>Post Image – Show featured image for single post.</li>
<li>Post Slider – Show recent post with carousel.</li>
<li>Popover Button – Hotspot button icon.</li>
<li>Site Menu – Show main menu as site navigation.</li>
<li>Special Option – Inner section width like Top section, Inner section position like common widget.</li>
<li>To Top Button – Show to Top Button.</li>
<li>Image Box – Show image box with button and text.</li>
<li>Image Box Carousel – Show image and button with carousel.</li>
</ul>
<h3>KEY FEATURES</h3>
<ul>
<li>Slideshow</li>
<li>Background Masking Image</li>
<li>Inner Positioning</li>
<li>Two Styles Heading</li>
<li>Post Meta</li>
</ul>

Gum Addon for Elementor

Offers inbuilt widgets for elementor that help to create design more attractive

Quote via Chat Button vs Gum Addon for Elementor