GNAT
GNAT or else GNAT Ada is an Ada front-end to the GNU Compiler Collection. GNAT is a validated Ada compiler. It implements all three consequent Ada standards: Ada 83, Ada 95 and Ada 2005. The front-end itself is written in Ada. The principal maintainer of GNAT is AdaCore.
GNAT is an implementation of Ada.
Other implementations of Ada.
GNAT is part of GNU Compiler Collection. You may find other members of GNU Compiler Collection at Category:GNU Compiler Collection.