GDB for Ada Snapshot
GDB is a multi-language source-level debugger developed by the Free Software Foundation.
AdaCore is maintaining a version of GDB where Ada support has been added. The majority of these changes are now part of the official sources, and thus read-only access to AdaCore’s version of GDB is no longer provided.
Official GDB sources can be obtained at: http://www.gnu.org/software/gdb/