Plan B: A backup plan for unforseen contingencies.
Plan B is an interactive PDF forms editor that lets you edit, save and re-edit PDF forms. It requires OS X 10.5.
UPDATE: Preview now lets you save and re-edit PDF forms! So, for all practical purposes, Plan B is defunct (along with Buffalo Bill).
To install Plan B in your Applications folder, first download Plan B, then double-click its dmg file. Next, drag the Plan B icon onto the Applications folder alias in the Plan B.dmg window.
Your edited forms data will only be visible in Plan B. To make the edited form viewable (but not editable) by another PDF viewer like Preview, flatten the file by doing a “Save as PDF…” in Plan B’s “Print…” dialog.
There is no charge to use Plan B, although its use is governed by the EULA you accepted by downloading it.
Your feedback will be appreciated!
UPDATE: The original upload, version ß2, only worked on Intel hardware; I’ve uploaded version ß3 which is a Universal Binary.