I've been using PHP and VBA for developing eBay API applications. PHP is best run from a server. I know it can be run from a desktop PC but clients are unwilling and unable to download and install it on their computers. VBA is great for desktop but again clients need a lot of hand-holding when setting up their references in the backend of excel and of course they need Microsoft excel in the first place. On top of that I don't think you can run PHP and VBA on mobile devices!!!
I want to develop apps where the client (or buyer of the app) can just download the app, install it and run it on windows, macs, and mobiles. I'm wondering what the best language is for developing eBay apps. Java seems to be a good choice. What do you other developers use and recommend.
Thanks for your hep.