Not only Magento, but also other ecommerce platforms like Shopify, WooCommerce can be supplemented with extensions and plugins. Having said that, there are both plenty of off-the-shelf solutions that are just a matter of selecting, integrating and customising, but also the woocommerce plugin development service in case you need something so unique that you can only get it through custom development.
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RE: How to choose plugins and extensions?
