A WordPress plugin that contains many blocks to build your RundizStrap theme, or you can use it with any Bootstrap 5 themes.
You can manually set CSS class(es) by referring to the Bootstrap document.
Supported custom HTML attributes like <code>data-*</code>, <code>aria-*</code> in most blocks.
Available blocks:
<ul>
<li>Customizable div</li>
<li>Layout container</li>
<li>Layout row</li>
<li>Layout column</li>
<li>Search (for navbar and anywhere else)</li>
<li>Pagination (for list posts)</li>
<li>Navbar container</li>
<li>Navbar toggler button (for responsive toggler)</li>
<li>Navbar responsive wrapper (collapse, offcanvas)</li>
<li>Navbar navigation (display menu items)</li>
<li>Button (link, or button)</li>
<li>Comment form</li>
<li>Post navigation (display next, previous post)</li>
</ul>
Tested up to PHP 8.5.
The original source code is on GitHub ( https://github.com/Rundiz-WP/rundizstrap-companion ). 
It contains the original source of blocks before compile/build and blocks that are already built, the build tools via Node package (package.json).

RundizStrap Companion

A plugin that contains blocks for the Bootstrap theme that help you customize your site in your style. All blocks are based on Bootstrap CSS.

Gregor Capuder

ProteusThemes

Primoz Cigler

Page Builder by SiteOrigin editor is great, but it lacks a “tabs widget”, so we created one.
The “Tabs for Page Builder” widget allows you to add multiple tabs with a tab name and tab content. The tab content is using the Page Builder editor, so you can build your own layout inside the tab content (add widgets, set columns, …).
The front-end display is the same as the tabs in Bootstrap framework.
<a href="http://gregorcapuder.com/tabs-widget-for-page-builder/" rel="nofollow ugc">More details about this plugin can be found in this post</a>.
Note: the front-end design is “bare bones”, so only the default Bootstrap CSS is used. So you should style it to your own liking with custom CSS. Maybe we will add some custom skins in the future, but I can’t make any promises.

Tabs Widget for Page Builder

Adds a "Tabs for Page Builder" widget, which can be used in Page Builder by SiteOrigin editor.

RundizStrap Companion vs Tabs Widget for Page Builder