YITH is the world’s leading independent developers specializing in WooCommerce plugins. Their framework allows for extensive compatibility so that many of the plugins complement each other.
Some of their most popular plugins include Gift cards, Wishlist, Request a quote and the new POS for WooCommerce, amongst others.
Customer support is central to their operation and they offer this 365 days a year and regularly achieve a 98% monthly satisfaction rate.
From the blog
Commercial Plugins, Commercial Themes