The outline mode can show HTML/XML tags

The HTML/XML outline mode can be filtered to show only the tags you want to see. The editor has a "Context" tab where objects can be added for content assist.

The outline mode can show Velocity directives.

The project preferences is used to select Javascript/CSS/Macro directores for content assist. Any resource (file/project/directory) can be associated with context objects for content assist with any file that exists under that resource.

The preferences page is used to set syntax hilight colors.