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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BuddyPress Sliding Login Panel
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SM Login Styler
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SureCookie – Smarter Cookie Consent solution (Beta)
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Lightbox Images for Divi Enhanced
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Horozont
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Tax Switch for WooCommerce
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Plugin Columns
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Eonet Project Manager
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Ad Rotator
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Easy SVG Support
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bbPress – Notices
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WP Real IP-based Access Control
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Purge Cloud Flare
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SEO-Tool – Keyword Density Checker
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Cubecolour New Plugins
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Easy External Links
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PhoneMe Order WooCommerce
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Hide Front End WP Admin Bar
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WP Color Browser
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Append extensions on Pages