GNU Binutils
http://sources.redhat.com/binutils/
Sources of GNU Binutils.

GNU Ada Compiler
http://gcc.gnu.org
The GNU Ada Compiler which is recomended to compile BfdAda.

Ada Unit Testing Framework
http://libre.act-europe.fr/aunit/
The Aunit package which is used by BfdAda for its testsuite.

GNU Debugger
http://sources.redhat.com/gdb/