Hacker News Reader

Maybe you mean apportable? They used a lot of stuff from GnuStep and implemented a lot of UIKit with JNI Bindings to the android UI toolkit. I spend 2.5 years maintaining a game written with it. My company had a license only for this game. Any code and other things we build on top of it (mostly wrappers for native 3rd party services) went the way of the Dodo. I wrote a Xib/Nib to cocos2d Converter to load nib files and create a cocos2d scene at serialization time. I build this on top of the nib reader provided by apportable.

Facebook acquired osmeta in 2013, which built a UIKit implementation that allowed for cross-compilation of iOS apps

Sounds like Apportable: https://github.com/apportable

Our company used them for some games and other things. I once ported a UIKit app that used autolayout and was surprised at well it worked. They were acquired by Google IIRC.