There is a nice website I use www.ffxivtriad.com

It shows you which NPC are 'active' and when their timers are..
Also shows you what cards you can win etc.

It doesn't say on the main page but you can register with the site and mark off which cards you have, after you do this they get greyed out so you can even easier see which NPC you still need to beat for what card website/settings I believe