LH Signing allows you to create configurable validated self hosted lists of people (users). This is perfect for petitions or event sign ups.
SpeakOut! Email Petitions makes it easy to add petitions to your website and rally your community to support a cause by using direct action.
Easily embed White House petitions from We The People into your WordPress site via shortcodes and widgets.
Create verified polls and petitions that enable users to send results to US Elected Officials, Govermt. Agencies, Corporations and 20,000 Journalists
Allows a simple petition or email based campaign action to be embedded into any wordpress page or post.
A widget/plugin that uses the Louder.org.uk Developer's API to access a petition details and form from a Louder campaign