[dismalaf]

Armory maybe?

[pier25]

Luxe was initially written in Haxe and they migrated to C++ eventually.

https://news.ycombinator.com/item?id=16616052

[prismatic6]

Armory did, and it does still look like it's using Haxe - https://github.com/armory3d/armory/wiki/setup - it bundles it in.