Paolo Bertinetti

QRMemo is a versatile WordPress plugin that enables you to automatically generate and display QR codes at the end of specific post types. The QR codes added automatically contain the URL of the page or post they are appended to, making it easy for users to share or save the page.
The plugin also supports generating QR codes using a shortcode, allowing you to insert a QR code with custom text anywhere in your content.
Key Features: 
* Automatically add QR codes containing the page URL to the end of posts, pages, and other custom post types. 
* Customize which post types should display QR codes. 
* Generate QR codes via shortcode, specifying custom text, size, margin, and alignment.
Libraries Used: 
* <a href="https://github.com/endroid/qr-code" rel="nofollow ugc">Endroid QR Code</a> – A powerful library for generating QR codes in PHP.
<h3>License</h3>
This plugin is licensed under the GPLv2 or later. For more details, see <a href="https://www.gnu.org/licenses/gpl-2.0.html" rel="nofollow ugc">https://www.gnu.org/licenses/gpl-2.0.html</a>.

QRMemo

QRMemo is a WordPress plugin that adds QR codes to the end of selected post types and allows generating QR codes via shortcode.

prettyboymp

CMS Press opens up the ability to create and manage custom content types and taxonomies for your WordPress site. 
It adds the flexibility to have more than just posts and pages for content by allowing the user to register their 
own post_types that can use their separate theming from the post and page template along with its own permalink structure.
Along with custom post_types, CMS Press gives users the ability to register their own taxonomies. With the addition of 
custom taxonomies, a user can tag or categorize content separate from the default tags and categories.

CMS Press

Adds ability to create custom content types (post_types) and taxonomies to your WordPress installation.

QRMemo vs CMS Press