Matheus Martins

This plugin gives you a report of plugins that are not updated. Then you can copy and paste the old version plus the new version to send to your clients telling them what you’ve done for your maintenance work.

Maintenance Snippets

This plugin gives you a report of plugins that need updates.

Stephanie Leary

Lets you create a content inventory right in the WordPress Edit screens, similar to the process you might use to assess your site’s content in a spreadsheet. You can mark content as redundant, outdated, trivial, or in need of a review for SEO or style. These content status labels work just like categories, so you can remove the built-in ones and add your own if you like. You can also assign a content owner (distinct from the original author) and keep internal notes. The IDs are revealed on the Edit screens so you can keep track of your content even if you change titles and permalinks. The plugin supports custom post types as well as posts, pages, and media files.
There’s an Overview report under the Dashboard menu that shows you which posts/pages/attachments/etc. need attention, sorted by user. This screen also lets you export a CSV file of the audit report.
The plugin creates three new filters on the Edit screens: author, content owner, and content status. This should make it easy to narrow your focus to just a few pages at a time.
You can display the audit details to logged-in editors on the front end if you want, either above or below the content. You can style the audit message with custom CSS.
New: you can now clear data from past audits and start over!
<h4>Translations</h4>
If you would like to send me a translation, please write to me through <a href="http://sillybean.net/about/contact/" rel="nofollow ugc">my contact page</a>. Let me know which plugin you’ve translated and how you would like to be credited. I will write you back so you can attach the files in your reply.
<h3>Notes</h3>
<h4>Filter reference</h4>
‘content_audit_notes’ filters the public display of the notes field
‘content_audit_dashboard_get_posts_args’ filters the get_posts() arguments for the Dashboard widget
‘content_audit_dashboard_output’ filters the table output of the Dashboard widget
‘content_audit_dashboard_congrats’ filters the congratulations message of the Dashboard widget
‘content_audit_csv_filename’ filters the file name of the CSV download
‘content_audit_csv_header_data’ filters the header label array in the CSV download
‘content_audit_csv_row_data’ filters the contents of each row (as an array) in the CSV download

Content Audit

This is a light-weight plugin that's very approachable.. I've found people like using it.

I could imagine more robust reporting features and other small polishes, but this plugin pretty much does exactly what it says and works great.

Great plugin I love to recommend

Lets you create a content inventory right in the WordPress Edit screens. You can mark content as redundant, outdated, trivial, or in need of a review.

Maintenance Snippets vs Content Audit