My take on the exercises at
http://whipperstacker.com/2015/10/05/3-trivial-concurrency-exercises-for-the-confused-newbie-gopher/
If you want to find free Ada tools or libraries AdaIC [2] is an excellent starting point. You can also take a look at my other source text repositories [3] or my web site [4].
[1] Source text repository: http://repositories.jacob-sparre.dk/gopher-concurrency-exercises
[2] Free Ada Tools and Libraries: http://www.adaic.org/ada-resources/tools-libraries/
[3] My repositories on Bitbucket: http://repositories.jacob-sparre.dk/
[4] My web site: http://www.jacob-sparre.dk/