Airbus used the new tech for their next generations of plane I believe. I guess the fly-by-wire has been used for the A320 soon after. ABS brakes, a more resistant steel alloy, there is this list in French for some of the innovation made for the Concorde and used elsewhere afterward.

http://www.club-concorde.org/ssc/ret_tech-fr.htm

Different times. Communications and financing are a different beast today. One can reach out to folks they'd never have interacted with in the old days (Twitter, for example). Someone with experience could put together 7 digit financing in a few days, 8 digit financing in weeks, maybe more.

This is one of the most interesting features (or bugs, depending who you ask) about the current time we live in. We can organize massive funding and technological efforts like this over morning coffee and Twitter banter.

I think Airbus owned them outright.

Airbus pledged to supply to tools and spare parts for Concorde until the late 2000s, so yes.

(Of course they stopped supplying them in 2003 when the service was retired after the crash).