In Pictures: Facebook’s most important open source...
PHP was for a long time the lingua franca of the Internet. But between security concerns and functionality, many organizations want to upgrade code written in PHP to more powerful languages. But doing so was quite a substantial undertaking in the past. HipHop is an easy and free tool that converts PHP code into C++ code. Coders and hackers really appreciate these kinds of tools.
In Pictures: Facebook’s most important open source projects