Does it exist a programming platform / language independent random number generator?
A family of libraries that given a seed will return the very same sequence of (obviously pseudo-)random numbers, and that exist for the most used programming languages / platforms (at least C, JMV, CLI, php, python) and guarantee for platform compatibility (win/linux/mac/android)
I know I can implement a well known algorithm myself for all, but we all do know that writing a random number gen. is DIFFICULT, so a bullet-proof implementation could be a nice thing to have.
Get a C library you like. Use the FFI facilities of any other language to access it. Job done.
Update: If you are trying to design a distributed poker system, an identical library is not going to get the job done. Instead, read about the well-studied area of mental poker: http://www.google.co.uk/?q=mental+poker