With the Relative Posts plugin widget you can show up on the sidebar a list of related articles with or without thumbnails very easy.
More Plugins
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My Eyes Are Up Here
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Buckets
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WPLMS CoAuthors Plus
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Cat-Comment-Filter
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Easy Random Quotes
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jQuery Notebook
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AboveWP Page Loader
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KCPT Fading Image Widget
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Simplify Admin Menus
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Docs
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Buyte
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BD Courier Order Ratio Checker
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Social Like Box Slider
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Ninja Embed Plugin
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XT-Easy-Google-Adsense-Injection
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Amazon Affiliate Link Checker – AMZ Watcher
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Simple Export to Markdown
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DSGVO Youtube
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Light Admin Theme
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Notify Old Blog