Probably, yeah. I'm not a programmer, so I'm liable to get names mixed up unless it's something popular, based on what I know.
Apparently there's a free one, but the limitations prevent some fancy feature the PortableApps.com Platform uses from compiling, so the $1,000 version is required. As I understand it.
I guess it's still "open source" if the IDE costs an ungodly amount of money to legally use, but it seems to me that it gets around the point of being "open" by artificially limiting the number of people who can potentially (and legally) work on it. But then I'm not a programmer, maybe it has some advantages over the ones that are free to develop with. I think John's said it's faster and more efficient than C++. I know Assembly Language is the most efficient, but also harder to code for. I guess the easier it is to code, the less efficient it is -- maybe. Mostly speculating.