This plain looking text-only plugin took off in a hurry for a good reason: it adds a comprehensive set of menus for inserting CSS properties, templates and other related code snippets.
Script programmers spend a good amount of time quoting and unquoting strings. This plugin adds several options to the Actions Bar and the right click menu to make it easier to quote the selected text.
Looking for a quick way to convert text paragraphs to HTML? This plugin applies multiple HTML tags to text, based on the number of blank lines between the lines.
Can't remember what #ffddee looks like? Simply place the cursor on a color value or a name and click the View Color icon (or press the assigned keyboard shortcut).
XHTML Basic plugin. W3C's description: "XHTML Basic provides an extensible XHTML document type that is rich enough for simple content authoring that can be shared across devices from desktop computers to TVs, PDAs, pagers, and mobile phones....