While not really a replacement, there's always j2objc. On the downside, it doesn't provide APIs, it just translates Java to Objective-C source. On the upside, i

While not really a replacement, there's always j2objc. On the downside, it doesn't provide APIs, it just translates Java to Objective-C source. On the upside, it's straightforward, fast, and can be integrated with Objective-C/Swift code easily via a GWT-like JSNI mechanism. Some people have wired it up to libGDX and PlayN to provide a layer for writing games. I will say that as soon as Xamarin bought RoboVM my heart sank. I had a feeling Microsoft was going to buy Xamarin, it made perfect sense to do so, the only other choice would have been to buy Unity (which they could still do) And of course, if MS bought Xamarin, there would be no point in maintaining both a C# and Java product.