Apart from the program used for the site, there are thinking tools, logic software that may make it easier to organize.
A less expensive, though full featured program is PC-Outline that is quick to learn though it is all text and didn't have mouse support the last time I checked (about 2000) and hadn't been updated since 1988. IBM PC and compatible:
Brown Bag Software,
2155 S. Bascom Ave, Suite 105,
Campbell, CA 95008
for Mac or PC, a little more expensive, is:
Inspiration Software, Inc.,
2920 S. W. Dolph Court, Suite 3,
Portland, OR 97219
for Mac or PC, the most expensive one, more than an Outliner, is:
Symantec Corporation/Customer Service,
175 W. Broadway,
Eugene, OR 97401
Maybe whitewings knows about them or something similar. I'l try to getting around to seeking out where they might be on the web and add it to this post.