My software development experience lies far outside of the web/mobile app development world, so perhaps this idea already exists...
Similar to how PG and RTM created Viaweb (a web application that allowed non-technical people to build online e-commerce sites), are there any sites/tools which allow non-technical people develop non-trivial retail/online purchasing iPhone/Android apps?
There plenty of limited functionality (trivial in your words) style WYSIWYG style app builders. But for non-trival apps the best I've seen is https://www.dropsource.com/ They do seem to be solving this problem but not focusing on complete non-technical people, just people without direct mobile experience.
Similar to how PG and RTM created Viaweb (a web application that allowed non-technical people to build online e-commerce sites), are there any sites/tools which allow non-technical people develop non-trivial retail/online purchasing iPhone/Android apps?