I have not seen anyone post something like this before and I saw a few people ask. This website is run by one of my FC Leaders and he just added a feature that allows you to check the minions you currently have and need. Also, how and where to get them. In addition to mounts. :)
The creator is the character you see with this link. On the Left, enter your server and name to see your minion/mount stats.
http://www.xiv-minions.com/user.php?name=Aqualin+Riversong&server=Excalibur
Enjoy!