
A Silo is a way to organize your website or blog’s internal linking structure to direct and control the flow of PageRank and authority throughout the site. It organizes your pages so they follow a natural LSI-type progression from the broad topic home page, to a niche topic category page, and finally to the specific topic post page. The importance and authority of each page is increased by the related page linking to it.
Here’s how a Silo structure looks

Virtual Silo enables the average blog owner to get the most benefit from a Silo structure without the headache and frustration that goes along with manually converting your site.
Features:
Price: $57.00
WP Content Aggregator will auto-publish WP Posts based on your search keywords.
Price:
10,000x – $49.00 (The license is valid up to a max of 10,000 posts)
100,000x – $99.00 (100,000x The license is valid up to a max of 100,000 posts)
200,000x – $149.00 (The license is valid up to a max of 200,000 posts)
WebThumb uses the Bluga WebThumb API to create web thumbnails and full size snapshots of websites. It works with both WordPress as well as Joomla. It enables your visitors to take elegant screenshots of their favorite websites, upload them on your own website or blog and let other users rate and comment them.
For WordPress: The WordPress plugin can be installed like any other WordPress plugin. Works with WordPress 1.5+ (Updated to latest 2.8.4).
For Joomla: You will need to install it as new component in your Joomla site. You will then need to enter your Bluga API key in the Components >> Bluga >> Configuration at your Joomla admin panel.
You can get your API keythrough the Bluga website. You will get access to the API and 100 free credits per month. If you need more credits then that, you can purchase them at a rate as low as $1.75 per 1000.
Price: $57.00

WP Cloner is a server-based script to copy a part or all of an existing WordPress blog to another one quickly. It lets you perform one-click cloning from your Master blog to several Target blogs. As a reminder you can clone blogs which have been manually installed or auto-installed by WP Auto Installer
You just need to enter your login information and start the cloning process. For multiple and instant clones, you can import the list of WordPress blogs you want to be cloned from a csv file.
Price:
500 WordPress Clones: $99.00
1000 WordPress Clones: $149.00
2000 WordPress Clones: $199.00
Do you have multiple wordpress sites? Do you wish to have common user logins across your wordpress sites? Then this is the best plugin for you.
WP Users Sync allows you to to easily synchronize your users between your WordPress blogs. You can quickly define a central blog where you centralize your users and then define a number of blogs as sub-blogs. Once WP Users Sync is activated on both central and sub-blogs, every time you will update users at central blog, all changes will be immediately copied to all your sub-blogs.
Works with all wordpress versions from 1.5+.
Price: $57.00
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