Opal Screen Shots
Multiple selection allows you to reorganize quickly, or apply a type style to a group of topics.
Using the toolbar search field, you can filter out only topics of interest.
Reorganize your list by drag & drop (you can also use the keyboard).
You can focus on a subset of the outline…
…and search just within that subset. Note that the view has been zoomed, to magnify the text.
Use checkboxes to track tasks. Opal checks off a topic when all its subtopics are checked.
Opal can sort your work in a variety of ways.
Save your work in a number of standard formats.