In the early days, we wrote our own. We developed modules and administration consoles that could be tailor made to the customer. Today, there are plenty of sophisticated systems, and we've dealt with many of them. We've written modules for OpenCart and we've designed sites with nopCommerce. We've developed multi layer product categorisation and linking, postage calculators, stock monitoring and customer tracking, as well as implementing off the shelf modules such as image carousels, menus, address auto-completion and plenty more. If you want something that nobody else has got, just ask...
