I would probably rule out Gamemaker Studio if you wanted to make things other than games, but the advantage is you write the code once and it ports to many platforms with little effort. I personally would have considered using it if I wasn't already deeply entrenched in B4A. I think its pretty cool.

HTML5 is up and coming and you can write the code once and put it in different wrappers for the different platforms, but the support as not as seamless.

This article talks about coronaSDK:

http://ipad.about.com/od/iPad-App-Dev/fr/Review-Corona-SDK-For-iPhone-And-iPad-Development.htm

It says it's limited but if you are devoted to LUA, it may be the way to go for you.

The actual java code for my game, Hail of Gunfire, is 4800 lines of code. My B4A code that I wrote is only 2500 lines and the java code is ugly gibberish.

I ported all my games and apps to BlackBerry and made $3000 and got 6 devices from them for free. I also had a client pay me $500 to write a upd transmitting status board app.

Not bad for spending $100 to get started January 2012.

Here is the link if you are interested.

These days, I'm making Html5 games in Construct 2 and wrapping them with B4A to publish to Google Play. Way easier- I published 4 games in a week and a half!