paulpela

This plugin lets you sell your ebook, software package or anything else small enough to fit into a standard email message (less than 10MiB is safe).
The buyer obtains a code through premium sms service and enters it along with his or her email addres in the form. If the code is correct, Sell from Blog creates a message, attaches your package to it and sends it to the buyer’s email address.
The package you want to sell is placed on your own server, in a secured directory which is not accessible from outside.
There is also a dashboard widget which shows you how many codes you have left and gives detailed info on last 25 transactions.
Additionally, you can ask buyers to let you send additional information to their email address (can be turned on of off in the admin section).

Sell from Blog

Sell from Blog lets you sell your ebook or software package via premium SMS payments.

cpexcalibur

Excalibur is a service that enables you to start selling your content with a free plugin that is easy to install and setup. It helps businesses monetize, manage and grow revenue into digital world. We offer a game changing highly configurable & independent platform. It is a safe and secure paywall with all the required flexibility that a digital publisher expects at the fraction of the cost of other vendors. 
Excalibur is the best way to drive revenue on your site through paid subscriptions. Your visitors can either pay for individual pieces of content or purchase subscription access to your entire site. This model has been very beneficial for companies like NY Times and it could be for you too.
Any site, large or small, can use Excalibur to easily build a new revenue stream from paid content. We’ve seen that a simple paid content plan can quickly surpass what you can earn from advertising, 
even if you’re only selling access to a small percentage of your site’s content. As both audiences and business models change over time, using a provider with a flexible and easily extensible architecture will be invaluable. Allowing you to experiment with new content offering and settings in the future is what we developed. We have a demo page you can check out here: https://lightbox.astroexcalibur.com/lightbox/demo/pages/sidebar-left.html
Some of the great features that are available to all clients:
<ul>
<li>Options to adjust meter limit on the fly.</li>
<li>Ip exclusion (single or range allowed with limitations) to allow free access to staff or licensing your content</li>
<li>Customer dashboard where they can update their passwords, information.</li>
<li>Functionality to enable/disable paywall</li>
<li>Social media tracking</li>
<li>Cookie-less browser content protection</li>
<li>Incognito mode</li>
<li>Ad Blocker/Web and referral traffic statistic</li>
<li>Customer Service interface for managing customer accounts to issue refunds.</li>
<li>IOS/Android SDK to power content protection for you mobile apps. </li>
</ul>
Excalibur plugin can also be used as donation tool, or user management feature to help your site keeps track of customers. This flexibility can allow you to focus on your business 
and let us handle users and payments logic for you.

Excalibur Paywall

Excalibur is the best and most affordable content monetization software on the market. Easiest plugin to configure with the most features.

Sell from Blog vs Excalibur Paywall