ShipStation

ShipStation has been a key ingredient in our multi-store setup for nearly 5 years and it's worked exceptionally well for us that entire time. The feature set has stabilized and there aren't any crazy surprises, it's uptime has been fantastic, and the value-adds they released with aggregate carrier rate discounts w/ USPS & UPS have been great. It does serve as an ingestion point for another piece of software further in our workflow, and the integration that direction has been great as well. All-around great stuff!