[AndrewGarner]

Look into F#.

It's open source. Works on Linux, Mac OS X, Android, iOS, Windows, etc. It has a good ecosystem and tooling built around it already but you can also tap into the C# ecosystem, if necessary.

It compares really well to Swift: http://www.slideshare.net/ScottWlaschin/swift-vslanguagex but even without that comparison, it's worth a look on its own.

[melling]

I've looked into F# a few times. It's not ready on Mac. I wish people would quit suggesting until it's really baked.

[AlphaSite]

Does it really work on iOS sans xamarian?