Big, Middle, and Little Endians

Remove Category URL strips the /category/ base from your category URLs, turning something like /category/my-category/ into simply /my-category/.

Convert Greek characters to Latin on all your site's permalinks instantly.

Easy to change Permalink of custom post type.

Allow long permalinks in your WordPress. Useful especially for using non-latin characters in permalinks. Respects future relevant core updates.

Removes the mandatory 'Category Base' and every parent category from your category permalinks.

Set Custom Permalink Editor on a per-post, per-tag per-page, and per-category basis.

Atom Publishing Protocol support for WordPress

Automagically concatenates JS and CSS files that are output in wp_head() and wp_footer()

Adds Open Graph tags to your posts/pages/etc, adds a Facebook Like button to posts using simple Theme functions. Requires a Facebook Application ID ( …

Audio/Video extras not found in WordPress core.

Tumble is simple-to-use and allows you to manually send Posts, Images, Audio, and Video to Tumblr from within your Dashboard/Media Library

Provides an admin interface for inspecting Memcached instances and flushing items by key or group in an AJAX fashion.