Mario Peshev

WARNING: This script alters the database content so use at your own responsibility! Backup your database first.
Shortcode Freezer. If you have a website with content based on shortcodes 
and this content generates some static data (i.e. authors, pricing, buttons and other listing that just provides html markup with a ‘short code’), 
then feel free to convert that to the static values before switching themes. This would evaluate the shortcodes and generate the HTML markup and replace the database posts with the evaluated content.
Keep in mind that it would not work with dynamic listings that generate dynamic content – they would ‘freeze’ and will not be dynamic anymore.
You can switch themes without worrying about shortcode compatibility. Once the markup is generated and embedded into posts, your data would be visible and you can style the markup in the new theme.

DX Shortcode Freezer

Converting all static shortcodes to their static representation at the moment of generation. This plugin could alter your database posts.

Alexandru Vornicescu

This is a simple and clean plugin for generating new posts, categories and tags for your site.
Adding posts and terms for custom post types and custom taxonomies is possible too.
In the plugin there is an Admin Panel that will allow you to configure how many posts and with witch categories and tags to use.
You can choose to insert featured images for the posts. If you select to generate 10 posts, the first 10 images from the Media Library will be used as featured images.
Generating terms is very easy: just insert the number of new terms and select the taxonomy you want.

Generate Posts and Terms

Hey,
This does seem to break databases from my testing.  I reported this, but the author doesn't seem too concerned. Never did he work with me in an attempt to diagnose the cause. He just got defensive. But speaking of diagnoses, it was nice of him to wish me a cancerous death.  Fingers crossed! :)
To be fair, the plugin did work for me on a clean local testing install.  However, it did also break the DB of a site that had been running for several years 2/2 times attempted.
So, for local testing it has been useful.  And the DB has been repaired (twice) from recent backups, so that's all good.
Compared to similar plugins however, this plugin lacks reliability and severely lacks performance.  On a positive note, it does have a nice UI, with plenty of options.  Probably the best set of options I've seen from a plugin like this.
I was going to give this 5 stars, then it broke my site twice, so I opted for three.  Then I received a really positive email, so one star.
Thank you for the wonderful experience Alexandru Vornicescu.  I hope you don't die of cancer.



Broke my site, but worked locally - cancerous wishes may be included

Work fine.

This plugin will help you generate dummy new posts and terms.

DX Shortcode Freezer vs Generate Posts and Terms