Condless

WooCommerce plugin that sets default attribute for variable products automatically if only 1 option is in-stock.
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Variable product of T-shirt with color attribute (White/Blue/Black) and size attribute (S/M/XL): 
If only Black T-shirts are in-stock: default color (Black), default size (none). 
If only Small T-shirts are in-stock: default color (none), default size (Small). 
If only White and XL T-shirts are in-stock: default color (White), default size (XL).
<h4>How It Works</h4>
<ol>
<li>Before product variations is displayed to the customer, the plugin will check each attribute, and if there is only 1 in-stock option it will be set as the default.</li>
</ol>
<h4>Features</h4>
<ul>
<li>Stock: Set option as default when it’s the only 1 in-stock.</li>
<li>Per Attribute: Set specific option as default in all products with that attribute (from the Edit Attribute screen)</li>
<li>Top: Set as default the first option of each attribute.</li>
<li>Out of stock: Disable out of stock variations.</li>
<li>Add to Cart button: In archive pages display for variable products the attribute name instead of: “Select options”.</li>
<li>Select options: In single product pages remove the select options text if default attribute is set.</li>
</ul>

Default Attributes for WooCommerce

WooCommerce plugin that sets default attribute for variable products automatically if only 1 option is in-stock.

jkalawe

Default Category is a a helpful workflow tool:
<ul>
<li>
Enforce editorial standards for posts
</li>
<li>
A quick reference for content editors that aren’t regular contributors
</li>
<li>
Each user can have their own set of default categories
</li>
<li>
Site-wide categories will be applied if a user has not specified their own default categories
</li>
</ul>
<h4>Multisite</h4>
Default Category is also multisite compatible as it has been designed for a multisite environment.

WordPress Default Category

Auto select categories for new posts based on user or site-wide settings.

Default Attributes for WooCommerce vs WordPress Default Category