Actually Ada is quite unusual in that the official ISO standard has always been licensed under terms that permit unrestricted redistribution and even modification; it is AFAIK the only ISO language standard that you can install as a package[1][2] from Debian's "main" repository.

The language is thus more free than ISO C and C++, where everybody googles for "draft" pdfs and hopes their content does not substantially differ from the actual standard.

[1] https://packages.debian.org/jessie/ada-reference-manual-2005 [2] https://packages.debian.org/jessie/ada-reference-manual-2012

The main compiler nowadays for Ada is GNAT, the compiler is GPL and the runtime is LGPL.

In a sea of C-syntax languages I find an ALGOL-syntax language to be really neat looking. :)

I think the biggest problem with Ada is a small community/mindshare.