The form plugin is used to generate forms using the standard HTML form widgets.
This plugin is being phased out. It is too difficult to maintain both: the Editor and the Form plugins. Not only that, the Form plugin widgets are limited to what the HTML form widget implementation offers. Although that has been extended with HTML 5, it is still less than what we can offer with the Editor. We will certainly keep a copy of the plugin handy, but not support its implementation. If someone else would like to take that job over, it would be great. That being said, it may also be a waste of time to attempt to keep this one going although some people may still prefer to have standard form widgets for their website.