Mass Delete Unused Tags

Allows users to create a custom background on a per-post basis.

ACF field. Saves map center, zoom level. Disables map zooming on scroll. Shows location coordinates. Bonus for programmers.

Cleanup old metadata created by Advanced Custom Fields.

Easy to add page navigation in your blog

Adds an option to the admin posts and terms overview pages to select all items (instead of just the ones on the current page) to apply bulk actions.

This plugin allows you to upload a custom favicon & Apple touch icon for your website and your WordPress Dashboard using API customizer.

Crawls your website-pages based on google XML sitemap. If you have a caching plugin this will keep your cache warm. Speeds up your site.

Shows translated flags (for every language except current viewing lang) in the default or wp_nav_menu at last position

Plugin to reject spam. Port from same author from http://www.phpbbantispam.com Actually visits the URL from commenter to spider for spamwords.

Deletes all tags (or other taxonomies), handy tool if you want to start over with a quick clean blog.

GUI in backend to define constants without any programming knowledge. Every file in your theme has access to your constant.

Plugin to create a (more) stable site when having lot's of traffic