For those liking ruby, it might be of some interest that I set up a github repo for cross-compiling the embedded version of the language, mruby.
The repo is here: https://github.com/pbosetti/edison-mruby. It has a useful set of gems/functionalities, including MRAA bindings, YAML support, regular expressions, and GSL interface (for linear algebra, matrix/vector manipulation, linear solvers, LU and SV decomposition).
Any feedback is more than welcome. Cross building is not exactly straightforward (I'm working on a Mac, but I suspect there are very few differences on a linux box), so I am available to give support and hints, with the aim of improving the documentation and perhaps to automate the whole process.