On Thursday, October 4, 2018 at 11:38:15 AM UTC-4, Mark Hawkins wrote:
... "Flarm is a closed system". And why is that?

You will find a clear explanation of this policy he
http://flarm.com/wp-content/uploads/...patibility.pdf

As to wide adoption, most GA aircraft (including gliders) in Europe now
have FLARM; EASA now permits panel installation in certificated AC.

I'm a firm believer in open source (and funded it heavily in my former
corporate life), but I also know well how frequently it goes off the rails.
This application would suffer from anything other than top-notch,
full-time attention. Commercially-funded open source works when there are
lots of deep pockets with common interests (see GCC, newlib, RedHat, Eclipse).
Casual open-source, for small markets, without funding, not so much.

You may not agree with this, but it has been given serious consideration
but a lot of very committed and extremely sharp folks.

Respectfully, Dave

PS: Paper above doesn't mention REQUIRED FCC certification (and analogous
foreign certifications) - expensive, and REQUIRED.