This Addon for Komodo Edit/IDE simplifies some of the processing of hand-coding HTML.
The various tools either replace selected text with HTML code which would be more tedious to type or, in some cases, inserts snippets of HTML.
DOM Inspector is a tool that can be used to inspect and edit the live DOM of any web document or XUL application. The DOM can be navigated using a two-paned window displaying a variety of different views on the document and all nodes within.
This is a Komodo port of Xultris by 'mackers'*, a Firefox extension of the infamous Russian block-puzzle game Tetris. Added here to satisfy David Sklar's assertion that any sufficiently advanced editor will implement tetris.