Ship+ Checkout Delivery Dates

We use this app on two Shopify stores in different verticals. It's ostensibly a delivery date app, but it's also the best custom shipping method app we've found. It only supports UPS and FedEx. We'd like to see USPS support (displaying a delivery date range), and the ability to add pricing by weight not just order total. But if you use UPS and FedEx, this is the simplest custom shipping method app on Shopify and it works well.

Simplest shipping app that provides delivery dates based on actual carrier estimates. Only supports UPS and FedEx quotes. Allows you to change the name of the shipping method, for instance "UPS Ground" can be shown to the customer as "Economy"