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You can also choose a driver -- for instance, DGD supplies some features not found elsewhere. But if you use DGD, you have to use LPC so your language choice is made as well.
The main compelling feature for me was the rlimits() construct, which will cleanly cut off a thread of execution after a given amount of time. Other unique features of DGD include atomic functions -- a given function is guaranteed to fully execute or else leave no trace, including any global variables writes that it may have done. In DGD, any function may be declared atomic and the only operations it can't perform are network read/write and file read/write.
As a result, DGD can't really do callout to other languages since other languages can't manage either the "cleanly interruptable" functionality or the "atomic" functionality. You can precompile LPC and you can use C to extend the driver, but mainly you just have to use LPC.
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