We developed several crucial opencart modules/extensions having wide functionality and great compatibility (not only with the default opencart features, but with custom themes too). Our solutions are mostly focused on advancing or extending the opencart functions related to product options. Most of them are available in versions for opencart 2 and opencart 3.
Choosing our extensions you are also choosing professional support, installation and adaptation service, as well as the full compatibility of the code (all our modules are compatible to each other; we provide adaptation to commercial themes).
All our extensions are also available on the official opencart marketplace https://www.opencart.com/