Digitalastic

LinkBoostr by Digitalastic helps content teams and SEO specialists streamline internal linking. Stop manually searching for relevant posts to link to—LinkBoostr does it for you using intelligent content analysis.
<h4>Key Features</h4>
<ul>
<li>Smart Suggestions: Get 5 contextually relevant internal link suggestions based on your content</li>
<li>One-Click Insertion: Insert links instantly with suggested anchor text</li>
<li>Gutenberg Sidebar: Beautiful sidebar panel in the block editor</li>
<li>Classic Editor Support: Meta box for those using Classic Editor</li>
<li>Orphan Page Detector: Find and fix pages with zero internal links</li>
<li>Background Indexing: Automatic TF-IDF indexing with zero performance impact</li>
<li>Multisite Compatible: Works seamlessly across WordPress multisite networks</li>
</ul>
<h4>How It Works</h4>
LinkBoostr analyzes your content using TF-IDF (Term Frequency-Inverse Document Frequency) algorithm to:
<ol>
<li>Extract important keywords from your posts</li>
<li>Build a searchable index of your content</li>
<li>Find semantically related posts when you’re writing</li>
<li>Suggest relevant anchor text based on content overlap</li>
<li>Let you insert links with a single click</li>
</ol>
<h4>Perfect For</h4>
<ul>
<li>Bloggers looking to improve internal linking</li>
<li>SEO specialists optimizing site structure</li>
<li>Content teams managing large sites</li>
<li>Agencies working with multiple clients</li>
<li>Anyone who wants better internal links without the manual work</li>
</ul>
<h4>Free Features</h4>
<ul>
<li>Up to 5 inbound link suggestions per post</li>
<li>Smart TF-IDF analysis and keyword detection</li>
<li>Cross-tab workflow with phrase highlighting</li>
<li>Color-coded relevancy scores</li>
<li>Gutenberg and Classic Editor support</li>
<li>Orphan page detection</li>
<li>Broken internal link checker</li>
<li>Link density warnings</li>
<li>Dashboard widget with quick stats</li>
<li>Interactive onboarding tour</li>
<li>Manual and automatic indexing</li>
<li>Post type exclusions</li>
<li>REST API access</li>
<li>Full i18n support</li>
</ul>
<h4>Pro Features (Coming Soon)</h4>
<ul>
<li>Automatic link insertion</li>
<li>Bulk link operations</li>
<li>Advanced analytics & reports</li>
<li>Custom post type support</li>
<li>Export/import functionality</li>
<li>Priority support</li>
</ul>
<h3>Source Code</h3>
The uncompiled source code for the Gutenberg block is included in the plugin:
<ul>
<li>Block source: <code>blocks/link-suggestion/src/index.js</code></li>
<li>Block styles: <code>blocks/link-suggestion/src/styles.scss</code></li>
<li>Compiled output: <code>blocks/link-suggestion/build/</code></li>
</ul>
The plugin also maintains a public GitHub repository with all source code: 
https://github.com/digitalastic-hub/linkboostr
Build Instructions:
If you want to rebuild the Gutenberg block from source:
<ol>
<li>Install Node.js and npm</li>
<li>Navigate to the plugin directory</li>
<li>Run <code>npm install</code> in the <code>blocks/link-suggestion/</code> directory</li>
<li>Run <code>npm run build</code> to compile</li>
</ol>
All other code (PHP, CSS, JS) is uncompiled and human-readable.
<h3>Privacy Policy</h3>
LinkBoostr does not:
<ul>
<li>Collect or transmit any user data</li>
<li>Make external API calls (all processing is local)</li>
<li>Track user behavior</li>
<li>Use cookies</li>
<li>Store personal information</li>
</ul>
All content analysis happens on your WordPress server. Your data stays yours.
<h3>Support</h3>
<ul>
<li>Documentation: Visit our <a href="https://digitalastic.com/linkboostr/docs" rel="nofollow ugc">documentation site</a></li>
<li>Support Forum: Get help on <a href="https://wordpress.org/support/plugin/linkboostr" rel="ugc">WordPress.org forums</a></li>
<li>Bug Reports: Submit issues on <a href="https://github.com/digitalastic/linkboostr/issues" rel="nofollow ugc">GitHub</a></li>
</ul>
<h3>Credits</h3>
Developed with ❤️ by <a href="https://digitalastic.com" rel="nofollow ugc">Digitalastic</a>
Contributors: 
* Manish Bhagat – Lead Developer
Special Thanks: 
* WordPress community for excellent documentation 
* All beta testers and early adopters

LinkBoostr

Smart internal linking assistant that finds link opportunities in existing content and helps new pages rank faster—safely and effortlessly.

I'm a Ninja

This interlinking plugin for WordPress will let you easily and meaningfully link to your old articles, pages or other sites to improve their rankings in search engines and generate more clicks.
The Internal Link Building plugin lets you assign keywords to given destination URLs. This way your website will link within itself like it’s done in Wikipedia – every time a keyword occurs, it links to the page you specified in the plugin dashboard.
You can: 
* set the words to be case sensitive (to only interlink your brand name for example), 
* make links nofollow (makes sense when you link to affiliate products), 
* upload keywords in bulk, etc
Note: Please do use the plugin in moderation to avoid over-optimization. Meaningful and user-friendly inter-linking goes a long way!
This plugin is supported by <a href="http://www.internetmarketingninjas.com/" rel="nofollow ugc">Internet Marketing Ninjas</a>.
<h3>Arbitrary section</h3>
The settings page is under the Posts menu -> Keywords in 2.7+. It’s under Manage -> Keywords, in older versions of WP (up to 2.5 or 2.6) .
<ol>
<li>
This plugin allows you to mass-upload keywords. So you just need to prepare a CSV file in Excel and then copy-paste it into the mass-upload box in your admin panel and then click upload! This is great for larger sites targeting multiple keywords that want to speed things up.
</li>
<li>
It’s up to you whether you make cAsE ReLeVaNT to your links. Check the “Exact Match” checkbox for it to only match when the case is the same as you typed the word into the admin panel. Leave it unchecked to have all cases link to your selected page.
</li>
<li>
Post-level overrides of globally-assigned keywords.
</li>
<li>
Link to sources or affiliate links whom you reference a lot.
</li>
<li>
Build internal links automatically to pages you regularly reference.
</li>
<li>
Make a link nofollow. For example, if you link to particular Wikipedia pages a lot then set the nofollow to be automatic.
</li>
<li>
Link multiple keywords to a single URL. Target all a page’s keywords at once! Just put a space, a pipe (eg |) and a space between the multiple keywords. E.g. affiliate | affiliate marketing. More efficiency! More time savings!
</li>
<li>
Pick the number of times a keyword will link to a particular URL. If you only want the words social media to link to your social media category once, you can do that. Notice that social gets linked next, since I also have that keyword assigned to link to the same page.
</li>
</ol>

Internal Link Building

line 706 of plugin is considered unsupported operator, didn't check the file itself, but going to leave this here for debug purpose.

not working since 4.7.3

This plugin will let you easily link to your old articles, pages or other sites to improve their rankings in search engines and generate more clicks.

LinkBoostr vs Internal Link Building