MB Term Meta
Add custom fields to categories, tags or any custom taxonomy with simple syntax.
Meta Box
BNFW Custom Fields Add-On
Custom fields shortcodes and triggers for use in Better Notifications for WordPress.
Better Notifications for WordPress
Meta Box Builder
Create custom meta boxes and custom fields in WordPress using the drag-and-drop interface.
Meta Box Conditional Logic
Add visibility dependency for custom meta boxes and custom fields in WordPress
Meta Box Group
Create repeatable groups of custom fields in WordPress.
Advanced Custom Fields: YouTube Field
Syncs up with the YouTube API to give you an awesome amount of flexibility.
Hal Gatewood