Hi,
To generalize (and I like to generalize)
all languages that do garbage collect, or otherwise cannot be trusted to keep deadlines, are no good for producing audio.
This goes for most modern languages, Java, C#, basically all scripting languages.
As I said, this is a generalization. In todays ever-faster computers the border is moving... still the best language for the job would be C/C++.
Some good IDEs for for "visual" development are, kdevelop, eclipse and a new contender QT Creator, which to me looks to be a extremely competent solution (especially for a first release).
Others will probably disagree.
/Robert