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.

marchenko.alexandr

Generate wordpress pages, posts, categories, comments for development enviroment in few clicks.
You can generate entire site content in one click, or configure each entity and generate it separately.
You will be able to generate: categories, posts, pages.
<a href="http://www.youtube.com/watch?v=6pMOfc28Pc0&feature=player_embedded" rel="nofollow ugc">Video on YouTube showing how it works</a>
Featured images generator added in 1.3, but be patient if you generate many posts it takes some time to generate featured images, wordpress also creates thumbnails foreach image. To exclude timeout error you may change execution limit for php scripts in your php.ini.
Post custom meta fields generator added in 1.4, now you can generate anything you want.
Notice: when you deleting content fron GWE page, all content will be deleted rather than fake. Please add real content just after you finish your work and deleted all fake content. Thanks @soragrey for feedback.

Generate WordPress Entities

Generate wordpress pages, posts, categories, comments for development enviroment in few clicks.

DX Shortcode Freezer vs Generate WordPress Entities