Zendesk

The Shopify/Zendesk is an integral part of our business, we use it to have surface-level visibility into customer order history and details as well as customer notes while doing sales and support. The app largely eliminates the need for an entire additional window. The reason I can only give 4/5 stars is that there are a few features I'd still love to see, that could truly let our team work solely through the Zendesk interface:
1. If we could place orders within the side-bar app
2. if we could connect ticket numbers with the SKUs in an order created from that customer interaction.