Will Norris

This is a plugin based implementation of Daryl Koopersmith’s modular themes concept and patch 
(<a href="https://core.trac.wordpress.org/ticket/12877" rel="nofollow ugc">#12877</a>). It provides the <code>get_template_module()</code> function, which allows for the creation 
of well-architected themes with highly reusable code. For more on the use of this function, 
read Daryl’s series of posts:
<ul>
<li><a href="http://drylk.com/2010/04/06/modular-themes-why/" rel="nofollow ugc">Modular Themes, Part 1: Why?</a></li>
<li><a href="http://drylk.com/2010/04/06/modular-themes-organization/" rel="nofollow ugc">Modular Themes, Part 2: Theme Organization</a></li>
<li><a href="http://drylk.com/2010/04/06/modular-themes-performance/" rel="nofollow ugc">Modular Themes, Performance</a></li>
</ul>
If you like this method of WordPress theme design, then vote up ticket <a href="https://core.trac.wordpress.org/ticket/12877" rel="nofollow ugc">#12877</a>. The ideal 
scenario is for this functionality to be provided in WordPress core. This plugin is simply a proof 
of concept, and provides an easy way for theme developers to start playing with modular themes. The 
bulk of this plugin is directly from Daryl’s patch. The one exception being the 
 update_template_hierarchy() function, which duplicates much of the template selection logic from 
 wp-includes/theme.php in WordPress core.

Template Modules

Add the infrastructure to enable Daryl Koopersmith's modular theme concept.

Pat Bloom

The PB Modular Pattern System (MPS) is a design and development system based on 6 so called ‘patterns’. Patterns can be seen as modular parts (on design and code level) that are assembled to bigger pieces of functional components which still can be updated without the need to rework them in other parts all the time. More about this on <a href="http://web.mps.systems" rel="nofollow ugc">http://web.mps.systems</a>
<h4>Features</h4>
<ul>
<li>Build a WordPress website completely modular – bases on 6 Patterns with MVC model approach</li>
<li>Create advanced re-usable Partials (and components) that can be injected with variables</li>
<li>Implement MPS in any (existing) template or use the example theme</li>
<li>Choose from front-end frameworks like UIkit, Bootstrap or WP Gutenberg</li>
<li>Based on rapid development, BEM and DRY method</li>
</ul>

PB Modular Pattern System

MVC / BEM based elemental and modular development system based on 6 patterns

Template Modules vs PB Modular Pattern System