Tinypass is the best way to charge for access to content on your WordPress site.
This plugin make your WordPress post payable. Registered users can buy your post via PayPal and so on.
BP FollowMe Allow members to follow other members activity.
Note: This plugin is no longer under active development. If you're interested in maintaining it, please contact me.
Allows you to add a Feedburner Email Subscription widget to one of your sidebars.
Clifton's Lightbox implements a lightbox subscription form overlay. Features a title, list, call-to-action, and image or video.
A sidebar widget which adds a newsletter subscription form to the sidebar of a WordPress site.
The UltimateAdminSms Plugin allows WordPress Administrators to send SMS to their users through the ultimatesmsapi.tk SMS Gateway.
WP FollowMe plugin allows you to add a twitter "Follow me" badge on your wordpress blog.
Create GoCardless subscriptions within WordPress.
Permite que o usuário inscreva-se e um comentário e recebe atualizações via e-mail.
Allows people to subscribe to SMS text message updates of your web site to users via cell phone.
Subscribe to Comments plugin has "subscribe without commenting" form, but you must edit your template to insert it. This plugin displays thi
Enable readers get notification blog updates via sms and allow blogger to send sms through dashboard with the Infoblast (http://www.infoblast.com.my)
The SMSGlobal SMS Plugin allows WordPress Administrators to send SMS to their users through the SMSGlobal Gateway.
Allow registered users to subscribe to categories giving them control over delivery times (e.g. daily or weekly digests) and format (html or text).
Add your blog to any browser! Get a bottom bar inviting users to subscribe to your website. It will add a custom RSS reader extension to their browser
A plugin for authentication/authorisation using Cloudware City for subscription access to a WordPress installation.
Corporate SMS solutions lets you communicate instantly with individuals or groups of customers; employees or suppliers, using DuduMobile's SMS m
yPHPlista integrates your PHPList install with beautiful AJAX.
The Online Outbox plugin allows you to easily add a subscription form to your WordPress site, to grow your list of email subscribers of your Email New
Manages subscriptions to email lists. Simply add [-ggis-subscribe-] to your post.
Cred is a payment system for WordPress that allows you to monetize your content or digital media (such as e-books, music or videos) through micropaym
Automatically prompt subsription message to promote and make visitor subscribe your feed every they post a new comment
Plugin Manages user subscriptions by creating and deleting user accounts while managing their payments.
AWeber Super Simple allows you to subscribe users to an AWeber autoresponder when they register on your blog. NOTE: ALPHA VERSION. Be careful. It's
Inserta lectores RSS web en tu blog - Insert web reading RSS in you blog
This plugin allows you to subscribe users to Aweber when they register or make a comment on your blog.
When a logged in user visits a blog for which they have no capabilities (i.e. not subscriber), they are automatically added as a subscriber.
Provides an all-in-one registration point for subscribers to your blog. Uses Paypal API and recurring billing.