Using Craft CMS? Keep Field Guide open while you write your templates!
Field Guide adds a tab to your Dashboard that lists all your fields in a single page, grouped by section. Matrix sub-fields are displayed in indented rows and and all field names are linked to their editing pages.
To install, drag the fieldguide directory to craft/plugins. Activate the plugin under Settings → Plugins. A new tab titled Field Guide should appear in the control panel.
Many thanks to Daniel Ott for his significant improvements.