Some business owners wish to see diagrams which can explain the software structure of a project visually. In those cases, UML is a good choice:
The following (kinds of) UML diagram are useful for that purpose:
Often, business owners are attracted to the tool, Visual Paradigm. Unfortunately, it is quite expensive.
The tool itself isn't web-based, but the company (free of charge) offers VPository, cloud storage for developers working collaboratively.
IMO, a download for each user is fine in itself if the project data is shared.
Its Professional Edition is the minimum practical level to obtain the features which business owners often are interested in: Requirements Gathering ("uexceler"), Task Management, and Wireframes.
Regarding Visual Paradigm's cost factor, they levy a surcharge to receive bug fixes for their software. (Like all software, I suppose it's buggy.) Therefore, currently the Single Seat License for the Professional Edition is really $838.50 per person (= $699 + $139.50). Floating Licenses—for transient project contributors—are $1,090.00 each (= $908.50 + $181.50. All prices are in US dollars.).
Maybe using Visual Paradigm is really taking things too far.
Basecamp can maintain a project glossary as a versioned, editable file.
For most projects, the database schema diagram can be auto-generated (at least once) and stored in Basecamp.
Perhaps User Stories, and images for each wireframe block, can be tied together in some easy fashion (see "Add-ons adding pictures to User Stories", below).
TOOLS SIMILAR TO VISUAL PARADIGM
I came across this list of tools similar to Visual Paradigm. Of them, the following might be useful:
Because Pivotal Tracker is quite successful (or popular), people have contributed quite a large number of add-ons:
Add-ons adding pictures to User Stories:
Add-ons adding User Stories from plain text:
Add-ons dumping User Stories:
Add-ons for bugs:
Add-ons for reporting:
Add-ons for testing:
Add-ons liaising other sites with Pivotal Tracker, also with Basecamp:
Add-ons liaising with Cucumber:
Add-ons liaising with GitHub:
Add-ons liaising with Redbooth:
Add-ons liaising with Redmine:
Other relevant add-ons:
OTHER POSSIBLY INTERESTING PLANNING TOOLS
Track Duck (highly popular) allows people to add comments to any website, after it automatically takes a screen shot.
Track Duck integrates with Pivotal Tracker and Basecamp, etc.
With it, one easily can add (one or multiple) images to Pivotal Tracker User Stories, and also create images for Basecamp. But see other "Add-ons adding pictures to User Stories", above.
Reviews of Track Duck:
Copyright (c) 2014 Mark D. Blackwell.