I tried giving this a search, but couldn't get an accurate bead on anything and thought if it hadn't been posted, would make for a great thread.

What are the best IDE(s) for Python, Perl, PHP, C, C++, C#, Java, BASIC, and any other languages that people deem fit to put here.

The requirements for posting should be:

1.  List the IDE.
2.  License type, if any.
3.  Commercial status (freeware, open-source, et cetera).
4.  Any relevant information such as a blurb about why you dig this particular IDE.

I also think advanced editors *could* be included, but *only* if they centralize on a given language.

I don't mean multipurpose editors that can highlight a thousand languages and offer shortcuts or macros to a compiler.  I cannot think of even one example of this, but who knows.  All I can think of are IDEs, multi-language IDEs, or ASCII editors, be they advanced text editors or no.

Oh, and if this thread has been done before, sorry.  "IDE" isn't a very fruitful search.