bielke

Bielke Rental Request Shop adds a rental catalog workflow to WordPress. Customers can browse rental products, add items to a request list, and submit a non-payment rental request.
Included features:
<ul>
<li>Rental products and product categories</li>
<li>Product detail pages with gallery, stock and variant fields</li>
<li>Request list / cart system</li>
<li>Checkout request form</li>
<li>Request management in the WordPress admin</li>
<li>Product gallery with media uploads and image URLs</li>
<li>Branding, colors and layout settings</li>
<li>Cart icon widget and shortcodes</li>
</ul>

Bielke Rental Request Shop

Create a rental product catalog, request list/cart, checkout request form, and manage incoming rental requests without WooCommerce.

stasionok

With this simple plugin you can restrict extra external requests made with internal WordPress WP_Http class. 
Just put in the filter rules field what you wish to restrict. One url part or url regex per line. 
By default, the plugin returns WP_Error answer for restricted requests. But you can put in response your custom response data.

ROB (rat out blocker)

Restrict execution of certain external requests with partial url or even regex to prevent personal data leakage (as example)

Bielke Rental Request Shop vs ROB (rat out blocker)