I've had a look (but not intensively, it's a back-burner thing for me at the moment). Everything seems very heavyweight and aimed at big businesses with long supply chains.

For a small ecommerce retailer, you don't want much like that; maybe I've missed it but there seems to be a gap for the Basecamp of this niche. A shopify plugin might be a good way to get standardised i/o rather than adapting to proprietary systems