Plugins
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Better WordPress External Links
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CM Tooltip Glossary
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Contextly Recommends
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Cross-Promotion Content Recommendations by Engageya
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Easy Footnotes
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FD Footnotes Plugin
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Footnotes for WordPress
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Inline Related Posts
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jQuery Hover Footnotes
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KCite
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MyBB Cross-Postalicious
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Related Links
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Related Links Blender
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Side Matter