Is there a free Ada compiler (or interpreter)?

There ARE indeed free Ada systems, and there is even choice: Ada/Ed for Ada 83, and AVLAda9X and GNAT for Ada 95. A complete list is available at the Ada Home, http://www.adahome.com/Resources/Compilers/Free.html (Strictly speaking these are free to distribute but NOT "public-domain". They are "free"--under copyright conditions known as "GNU Copyleft". In short: there is no warranty, and you are allowed to copy, modify, and distribute them; but you can't charge anyone for the software itself, and if the software (necessarily including source code) is further distributed, it must be done under the same conditions--i.e.  more

There ARE indeed free Ada systems, and there is even choice: Ada/Ed for Ada 83, and AVLAda9X and GNAT for Ada 95. A complete list is available at the Ada Home, http://www.adahome.com/Resources/Compilers/Free.html (Strictly speaking these are free to distribute but NOT "public-domain". They are "free"--under copyright conditions known as "GNU Copyleft". In short: there is no warranty, and you are allowed to copy, modify, and distribute them; but you can't charge anyone for the software itself, and if the software (necessarily including source code) is further distributed, it must be done under the same conditions--i.e. copyable, with sources and modifications, available to everyone else, etc.  more