Free Ada 95 Compilers & Environments

• GNAT GPL Edition
  Information on the publicly available version of the GNU Ada Translator (GNAT) compiler.
  
  
• Compilers Available from AdaBasis
  Links to a variety of Ada compilers from the AdaBasis free software repository.
  
  
• Catalog of Free Compilers and Interpreters
  A list of freely available software for language tools, including: compilers, compiler generators, interpreters, translators, important libraries, assemblers, etc.--things whose user interface is a language. Natural language processing tools may also be included.

Free Ada 83 Compilers

• GW-Ada/Ed for Apple Macintosh
  A program development environment built around the New York University (NYU) AdaEd compiler/interpreter. It allows the editing, compiling, binding and execution of Ada 83 programs.
• Ada/Ed, An Interpreter for Ada 83
  Ada/Ed is a translator-interpreter for Ada 83. It is intended as a teaching tool, and does not have the capacity, performance, or robustness of commercial Ada compilers.