Linux
A free implementation of a UNIX-like OS for personal computers created by Linus Torvalds. Debian GNU/Linux: The Universal Operating System
Debian is a free operating system built on the Linux kernel. Included with it are over 1526 packages (precompiled applications).
Red Hat Software
A computer software development company that sells products and provides services related to Linux, a freely available UN*X-like operating system.
Caldera
Caldera couples open-source operating system technologies, such as Linux, with traditional industry business practices, including channel partner distribution and support; leveraged third-party application development; and internal research and development, marketing and technical support.
The Silicon Valley Linux User Group (SVLUG)
A very active Linux user group located in the heart of the valley.
VA Research
Develops Workstation, Server, and Internet products using the Linux operating system.