Gnat for Macintosh - Project set up to provide a full-featured Ada development environment for the Apple Macintosh computer. - http://adapower.net/macos
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