Great question! I unfortunately don’t have a great system to track them, though ;)
Right now I find projects that interest me. Then I join their communities, e.g. Reddit and Slack.
The ICO gets added to my calendar when it’s announced in the community. I usually set a reminder a few days in advance. That reminds me to start preparing. However, all the info for the template’s usually not available until about 24 hours before the ICO starts.
Hope that’s helpful, maybe a little :) Let me know if you come up with a better system!