Not all languages came that way, but some of the major ones did: C was Bell Labs, C++ was also Bell Labs, Smalltalk was Xerox PARC. The main contemporary example in that vein is probably Go coming out of Google, though it remains to be seen how mature and widely used it'll get. For compiler projects, V8 coming out of Google and LLVM now being funded by Apple are two examples. Java is an example developed by a company with an eye towards product/monetization rather than as a research project, but is probably these days seen as a cautionary tale of why not to approach PLs as a business opportunity, because Sun pretty convincingly failed to monetize it.

There may be some social bias against paying for stuff, I think partially because people got burned with vendor lock-in. Technology changes so quickly, it's hard to know what a tool is worth before the fact.

But there's also a very real economic reality at play here. The most valuable platforms will be the ones with the most people collaborating on them, and that's always going to be the free or open platforms.

As you move up the infrastructure chain, I think people are more willing to pay for useful libraries or services, especially for ancillary stuff. But what rational person would build their business on something they didn't own?

  http://www.scala-ide.org

Sounds a bit like you used an old version ...