Specify that AudioEditor is gratis
Specify that Audacity is under GNU GPL

http://audacity.sourceforge.net/about/license
Specify that Au Lab is gratis
Specify that Atom is under MIT

https://atom.io/faq

> Is Atom open source?
> Yes. Atom is MIT licensed and the source is freely available from the
> https://github.com/atom/atom repository.
>
> All core Atom packages provided by GitHub are also available under the
> MIT license.
Specify that Atlantis is gratis
Specify that Atext is commercial software
Specify that Asepsis is under 3-clause BSD

https://github.com/binaryage/asepsis/blob/master/license.txt