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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EP Exporter for Contact Form 7 (CF7)
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Duplicate Title Validator
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WP Views Counter
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Local Geo Search
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Contact Form 7 Textarea Wordcount
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3D Viewer Block – Interactive 3D Model Display
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SEO Checker
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Media Folder
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azurecurve Series Index
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Maintainer – Maintenance Mode & Coming Soon Pages
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WP Simple Mail Sender
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JPEGcrypto
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Post Carousel & Slider
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Classic Editor and Classic Widgets
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BuddyPress Monster Widget
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First Order Coupon Manager for WooCommerce
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AC's Retirement Age Calculator
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Integrate nekorekten.com for WooCommerce
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WPSSO Tune WP Image Editors
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Total Spent by Customer for WooCommerce