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The company that owns VxWorks, Wind River System, did involve in BSD circa 2000, and the most can be said is early VxWorks did share some lineage with BSD Unix, but ever since VxWorks has been switched to WIND kernel, I doubt we can really put these two OSes in the same group.

Now owned by Intel.

Actually the internet runs on Tcl:

http://en.wikipedia.org/wiki/Cisco_IOS

Newer Cisco IOS versions (IOS XE for example) are running as a process in linux. Old IOSes were linux-based too. Don't mix up Cisco IOS with Apple iOS (which has roots in BSD).

huh. I thought they were using a QNX based one on the new stuff.

Plain old IOS is a monolithic program and tends to be used in older routers and current small-to-medium routers & modern spins of older product lines.

IOS XR runs on QNX and tends to be used on routers in a carrier role.

IOS XE runs on Linux and tends to be used on service/aggregation routers.

Good to know. Thanks for the info.

Not sure what you mean, but VxWorks is not based on FreeBSD.