An easy way to add custom fields to your object types (post, pages, custom post types, users)
This is a set of extendable classes to allow easy handling of custom post fields.
Easily add a PayPal 'donate' or 'buy now' button to your site.
This plugin checks for all custom keys in page/post ending with _Custom_Field_Cookie, writes key as cookie name & value as cookie value.
Inserts a Wikipedia-like metabox into posts with all the post's associated custom fields and taxonomy terms.
This plugin add custom fields for some things on WordPress, term taxonomy and custom object types
The Linked Pages plugin allows links between posts to be created using customisable page pickers and then displayed using the built in widget.
Use shortcodes to automatically generate and format titles.
Provides logging and debugging data via e-mail and FirePHP.
Tired of typing in the same default content at the end of your post? Use the same custom fields for each new post? Make your WordPress install do it