Back in 2006 a patch was made to add the Ada language to Ctags. I'm not the author of the "ada.c" file, but I do use it a lot. It would be nice if it could be integrated in Exuberant Ctags.
Sietse van der Molen
Add ada support to Exuberant Ctags
Let me add here that the patch is obviously new and tested against trunk.