Coingate looked promising with shapeshift support for altcoins, but when registering:
"We have detected that you are currently located in the United States of America. Please note, that for regulatory reasons, you can not use our services if your company is located or registered in the United States of America."
To Coingate's credit, they let me pick a country on the error screen, so I chose Ecuador just to see what their webapp looks like:
Works with instant notice of payment, so that is good. Also shapeshift.
Coingate's app copies the Bitpay app pretty well and is super easy to get started. However, setup will scare off most business owners with the message about not being able to use them in the US.
Their back end looks nice too: