Ada Home - Free Compilers
GW-Ada/Ed for Macintosh. Includes links to download the 1995 version of the software, and installation instructions.
http://www.adahome.com/Resources/Compilers/GWU-Mac.html
GW-Ada/Ed-Mac
Information about the development environment for the Macintosh, supporting integrated editing, compiling, and execution of Ada programs, and links to a discussion mailing list.
http://www.dslextreme.com/users/fabrizioo/gwada.html
Gnat for Macintosh
Project set up to provide a full-featured Ada development environment for the Apple Macintosh computer.
http://adapower.net/macos