The actual package distribution/management (it is also a replacement for virtualenv) is conda (http://conda.pydata.org/). Since it can be confusing, the difference between conda, anaconda and miniconda is described here: http://conda.pydata.org/docs/faq.html#general-questions
There is something upsetting about this website, and it may just be that this company is obviously for-profit, but I don't think it needs as much stock photography.
Conda is 100% free and open source, but is developed by Continuum, which is a company (but one that contributes heavily to many of the key components of the open-source pydata/scipy ecosystem, and whose CEO basically created numpy/scipy for the community at the expense of his academic career). Personally I have had nothing but good interactions with people from Continuum and the software they develop. They (as a company and as the individuals in it) do an incredible amount for the open source community and we all benefit from that. They seem to have worked out a sustainable model for running a company and working in/contributing to open source.
Well, this probably isn't the right place to complain about startups that are trying to make money, and I don't have any experience with NumPy, SciPy, or Conda.
I don't know. Do you use Google Chrome, Github, RedHat, LLVM?
Even gcc (egcs) was developed by Cygnus during an important stage.
0. https://www.continuum.io/