Darling is a compatibility layer which aims to be a benchmark in the support of Mac OS X applications, Apple's operating system, in Linux. it is basically the equivalent of Wine for OS X programs.
For now the project is quite green - it is currently in pre-alpha- and requires a lot of work to be a viable alternative. Also, if that wasn't enough, Luboš Doležel, the programmer in charge of the project, works with the applications one by one, which makes supporting them a truly gigantic task.
And then there's Apple's sparse and poorly written documentation.
'It is really unfortunate how badly written the Apple documentation in most cases, ”says Doležel, continuing,“ sometimes I have to experiment to find out what a certain function actually does […] This is why I appreciate [software] so much. open source; when the documentation is vague you can always look at the code.
Despite everything, Doležel has managed to get Linux Midnight Commander, Bash and Vim to work. He says that while it's not much and doesn't sound really exciting, it's clear proof that Darling "provides a solid foundation for future work."
Currently Luboš Doležel is the sole developer of Darling. You say you would like to implement support for games and software multimedia editing of OS X on Linux, adding that the tool could even be used in the future to run iOS apps; however, this requires years of work. Everything has to have a beginning though, right?
For more information you can visit the site The Darling Project.
More information - More about Darling at Ubunlog
Source - Ars Technica