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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CL WP Info
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Copy Link to Heading – Easily add Anchor links for Headings
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Icon Widget
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Insert Code by Angie Makes
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Easy SEO Toolkit
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Neptune Style Element
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WP-Compress-HTML
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WP Real IP-based Access Control
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TicketMachine Event Manager & Calendar
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ConvertCalculator: Build Cost, Price, Quotation, ROI Interactive Calculators
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Real Estate Fix & Flip Calculator
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JJ NextGen Image List
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Cargo Tracking for WooCommerce
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Pixobe Coloring Book
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Reddit for WooCommerce
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Lifetime Subscriptions for WooCommerce
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Broken Image Fallback
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miniOrange Embed Files for SharePoint/OneDrive
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GeeK! – Movie & Game Database
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Weaver II to Weaver Xtreme