This is a neat little summary of the proprietary companies out there using open source. The article starts with a neat claim:
So if you are going to master software you must master open source. You can’t do it otherwise. There is no way to succeed in a services world without it.
And goes on to list companies such as Apple, Microsoft, Google, IBM and Intel who are both using and contributing to open source software! Got to love it!
Learn more at TechCrunch.