Atiq Samtia

Change the Post Update date for all posts and pages in one click. This will help your blog in search engines and your blog will look alive. Do this every week or month.
<h4>Why Change the Update/Modified Dates of posts or Pages?</h4>
With massive increasde in blogs and content, now search engines like Google do rank the newly added or modified content higher than the older one. If the article was published in the past, Google thinks it is no longer relevent and de-ranks that. It is recommended by SEO experts that you should update the content regularly. 
If you update the posts manually, it would require a lot of effort weekly. If you have articles 500+ imagine how much time it would take you to do manually? This plugin will assist you in this regard and with only one click you are good to go.
<h4>Features</h4>
<ul>
<li>Update Posts Modified date in bulk</li>
<li>Update Pages Modified date in bulk</li>
<li>Update Any Custom Post Type dates in bulk</li>
<li>Update Post Comments dates in bulk</li>
<li>It Randomly distributes dates so it look realistic in the eyes of search engines</li>
<li>Select Custom Interval or Date Range </li>
<li>Apply on posts from specific categories</li>
<li>Apply on specific pages</li>
<li>Option to change Published Date or Modified Date</li>
</ul>
<h4>Support</h4>
<ul>
<li>Community support via the <a href="https://wordpress.org/support/plugin/bulk-post-update-date" rel="ugc">support forums</a> at WordPress.org.</li>
</ul>

Bulk Post Update Date

Working out of the box.

Thanks for the plugin.

Outstanding

Change the Post Update date for all posts and pages in one click. This will help your blog in search engines and your blog will look alive.

Aurovrata Venet

nir0ma

Category Import Reloaded is a wordpress plug-in which allows user to bulk create categories and taxonomies with a custom input format.
Plugins allows to :
<ul>
<li>Bulk create categories or taxonomies</li>
<li>Specify custom slug delimiter</li>
<li>Possibility to specify a custom slug for each categories</li>
</ul>
Default format for importing is the following :
<ul>
<li>
Without Slug :
Categorie1/subactegorie1
Categorie1/subactegorie2
Categorie1/subactegorie3
Categorie2/subactegorie1
Categorie2/subactegorie2
Categorie2/subactegorie3
</li>
<li>
Specifying slug :
Categorie1$categorie1-slug/subactegorie1$subcategorie1-slug
Categorie1$categorie1-slug/subactegorie2$subcategorie2-slug
Categorie1$categorie1-slug/subactegorie3$subcategorie3-slug
Categorie2$categorie2-slug/subactegorie1$subcategorie1-slug
Categorie2$categorie2-slug/subactegorie2$subcategorie2-slug
Categorie2$categorie2-slug/subactegorie3$subcategorie3-slug
</li>
</ul>

Category Import Reloaded

Thanks for continuing the Category Import plugin. 

Works well

Category Import Reloaded is a wordpress plug-in which allows user to bulk create categories and taxonomies with a custom input format.

Bulk Post Update Date vs Category Import Reloaded