Easily add Constant Contact signup forms to your website (sidebar or content) and configure how they look.
Add a VerticalResponse signup form to your sidebar. Lots of configuration options. Now with custom colors and shortcode support!
Embed a StreamSend sign up form to your website: users will sign up from your own website instead of from the StreamSend website.
Plugin for enabling users to signup to your MPZMail user group
Creates a public signup form where people can sign up for pot lucks, volunteer jobs, whatever.
Add To Post allows you to add additional content to either the start, end or both areas of your blog posts.
Safe Signup Form is a WordPress Plugin that will forward a form submission to an email address, while preventing most automated attacks.
Forces all users (except admins) to agree to your Terms and Conditions on first login and anytime you choose to make them accept new terms. Alternativ
This plugin integrates your wrdpress blog with Contactology Newsletter Service.
Add a Benchmark Email signup form to your sidebar. You can also manage lists, and edit and email your blogs to subscribers.
This is a simple and flexible plugin to handle signups with the form fields you define.
The Import Users to MailChimp allows you to quickly and easily import all existing users to mailchimp.
Logs the IP of the user when they register a new account. View the signup IP by going to the Users menu or by editing that user.
Emma Email Signup is a plugin to add an email signup form for your Emma account in your WordPress site.
Limit user registrations to domain names on a whitelist.
Simple create an event with guestlist and signup.
With this plugin registrations are only allowed if the user has an invitation code. This plugin is only for WordPress MU and is BuddyPress compatible.
Cosmic BP User Signup Password plugin allows buddypress site owners to let new user choose their own password at the time of registration.