GNAT
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.
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.