There are several great WordPress plugins available for eCommerce websites that can enhance functionality, improve user experience, and boost sales. Here are some of the best plugins with examples and references:

1. WooCommerce (https://woocommerce.com/) WooCommerce is the most popular and comprehensive eCommerce plugin for WordPress. It provides all the essential features for setting up and managing an online store, including product management, inventory control, secure payments, shipping options, and more. With its extensive library of extensions and themes, WooCommerce offers flexibility to customize your store to meet specific requirements.

2. Yoast SEO (https://yoast.com/wordpress/plugins/seo/) Yoast SEO is a powerful plugin that helps optimize your eCommerce website for search engines. It provides features like XML sitemaps, meta tags optimization, content analysis, and readability checks. By improving your website's SEO, Yoast SEO can increase organic traffic and visibility in search engine results, ultimately leading to more sales.

3. OptinMonster (https://optinmonster.com/) OptinMonster is a lead generation plugin that helps convert website visitors into subscribers or customers. It offers various opt-in forms, such as pop-ups, slide-ins, floating bars, and more, with advanced targeting and segmentation options. By capturing visitor information and building an email list, you can engage with potential customers, increase conversions, and drive repeat sales.

4. WPForms (https://wpforms.com/) WPForms is a user-friendly form builder plugin that allows you to create contact forms, order forms, surveys, and more. It integrates seamlessly with popular payment gateways, enabling secure transactions on your eCommerce website. By providing a smooth and hassle-free checkout experience, WPForms can enhance customer satisfaction and increase conversions.

5. MonsterInsights (https://www.monsterinsights.com/) MonsterInsights is a Google Analytics plugin that helps you track and analyze website performance. It provides valuable insights into user behavior, traffic sources, conversion rates, and more. By understanding your audience and their interactions with your eCommerce site, you can make data-driven decisions to optimize your marketing strategies and improve sales.

6. Easy Digital Downloads (https://easydigitaldownloads.com/) Easy Digital Downloads is a specialized eCommerce plugin for selling digital products like software, ebooks, music, and more. It offers features such as file access control, customer management, discount codes, and payment gateways integration. If your eCommerce website primarily focuses on digital goods, Easy Digital Downloads is a highly recommended plugin.

These are just a few examples of the best WordPress plugins for eCommerce websites. Depending on your specific needs and requirements, there are many other plugins available that can enhance your online store's functionality and performance. Always ensure to choose reputable plugins from trusted sources and regularly update them for security and compatibility.