CrestaProject

<a href="https://crestaproject.com/cresta-help-chat-demo-page/" rel="nofollow ugc">Plugin Demo</a> | <a href="https://crestaproject.com/downloads/cresta-help-chat/" rel="nofollow ugc">Plugin Homepage</a>
With Cresta Help Chat you can allow your users or customers to contact you via WhatsApp simply by clicking on a button. Users may contact you directly in private messages on your WhatsApp number and continue the conversation on WhatsApp web or WhatsApp application (from mobile). 
You can use the floating button which is positioned at the bottom right of the site or a button inside post or pages using the [cresta-help-chat text=”Need Help?” icon=”yes” position=”top”] shortcode. 
Cresta WhatsApp Chat is compatible with WooCommerce and WPML.
Some features
<ul>
<li>Add the button to open WhatsApp Chat at bottom right of your site</li>
<li>Use the shortcode [cresta-help-chat] to add the WhatsApp button in your posts, pages or custom post type</li>
<li>Choose which pages to show the WhatsApp Chat button</li>
<li>Mobile version: click the button and automatically open the WhatsApp App (if installed)</li>
<li>and more…</li>
</ul>
PRO version features
<ul>
<li>Change position of the box button</li>
<li>Change colors of the box button</li>
<li>Add tooltip on the box button</li>
<li>Change box size</li>
<li>WhatsApp widget</li>
<li>Different Animations</li>
<li>and much more…</li>
</ul>

Cresta Help Chat

Allow your users and customers to contact you via WhatsApp with a single click.

farazify

FAB (Floating Action Button) is a Free & Light Weight WordPress plugin which displays the beautiful Floating Action Button on your WordPress front-end. After triggering/hovering the main button it will pop-up and shows the row of sub buttons with details. This plugin provides the 9 types of the following buttons with different-different functionalities:
<ol>
<li>Text Button</li>
<li>WhatsApp Button (Click to Chat)</li>
<li>Facebook Messenger Button</li>
<li>Phone Button</li>
<li>Email Button</li>
<li>Viber Button</li>
<li>Snapchat Button</li>
<li>Line Button</li>
<li>Intercom Button</li>
</ol>
Admin Setting Panel
<ul>
<li>Basic Settings</li>
</ul>
<ol>
<li>Activate/Deactivate Floating Action Button</li>
<li>Change the Position of Floating Action Button to Top-Left/Top-Right/Bottom-Left/Bottom-Right</li>
<li>Option to Trigger Button by Mouse-Click or Mouse-Hover</li>
</ol>
<ul>
<li>Main Button Settings</li>
</ul>
<ol>
<li>Set Button Icon</li>
<li>Set Button Icon Color</li>
<li>Set Button Background Color</li>
</ol>
<ul>
<li>Sub Buttons Settings</li>
</ul>
<ol>
<li>Add Text Button with WP Shortcode Support</li>
<li>Add WhatsApp Button</li>
<li>Add FaceBook Messenger Button</li>
<li>Add Phone Button</li>
<li>Add Email Button</li>
<li>Add Viber Button</li>
<li>Add SnapChat Button</li>
<li>Add Line Button</li>
<li>Add InterCom Button</li>
<li>Change Button Title</li>
<li>Change Button Content</li>
<li>Change Button Icon</li>
<li>Change Text Color</li>
<li>Change Background Color</li>
<li>Buttons Sorting with Drag & Drop functionality</li>
<li>Remove Buttons</li>
</ol>

Floating Action Button

Display the beautiful FAB (Floating Action Button) on your WordPress front-end.

Cresta Help Chat vs Floating Action Button