WooCart is a responsive WordPress Shopping Cart and e-Commerce plugin. It integrates WordPress and OpenCart platform as a powerful native WordPress plugin with many great features.

Features:
Multi Stored
Integrated with WordPress front end and backend user login(single login)
Separate WordPress Widget(Categories,Shopping Cart,Information etc)
WordPress Admin Panel
Combined with WordPress template's CSS
Frequent Upgrades and Good Support.
WordPress Title,Meta Keywords,Description(SEO)
Integrated with WordPress Language
Fully OpenSource
Works with existing and new extensions(shipping,payments,modules,order total,product feeds) of opencart.
New extensions from OpenCart can be used as WordPress widget(Left or Right Positions)
No iframe used.
Integration with WordPress SEO URL
WordPress internal link to Product,Category,Information etc in WordPress Menu Item
WordPress Content shortcode(You can add your product in your WordPress post by this shortcode)
Show Admin Panel to specified user group of WordPress
Options for showing left/right column of OpenCart as well as WordPress Widget
Options for changing color of default template(button,menu etc color)
Responsive theme
Features of OpenCart
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Demo Site: http://demos.soft-php.com/woocart/shop/
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Support: https://www.soft-php.com/support.html
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See more details here https://www.soft-php.com/woocart-wordpress-shopping-cart.html