Easy to use yet very supported, Cross Platform tools that are free

[Gan]

I'm in the process of looking at easy to use, cross platform, free tools that applications built in them can run on the App Store.

Java - Cannot be put on the App Store
Xojo(formerly realbasic) - Not free
Haxe - Cross compatible, can be written and compiled to many languages, free, though no official IDE, used by many in 45 hour coding contests
Juce - Similar to Haxe
Dart - I'm not sure if you can put a Dart app on the App Store

That's my list so far.
I prefer Dart over Java. I'm also tied between Xojo and Haxe. I suppose if I could get Haxe working easily and if it were Simple, it'd take the cake for best performant native code compiling.

[Connors]

I believe this was popular for game-jams as well. I don't know all the details on how well it runs. I tried to run the "Hello world" tutorial recently because it's supposed to be SO SIMPLE and it didn't want to...

But I'm posting it anyways because I've seen people do really good things with it.

https://love2d.org/

[Connors]

Okay so maybe love2D isn't the best example but if you're looking for easy AND well-supported tools I recommend you add Processing.

http://www.processing.org/
http://www.processing.org/reference

It's got an option to compile for Java and Javascript, too.