Unfortunately there's no way that I'm aware of to do this except by tags as you've already observed. I also looked through the repositories that I usually watch on Github and there's nothing relevant out there so your options are to develop something of your own or to engage with the Agile Central Tech Services team at CA to do a custom app for you. For what it's worth we've had excellent experiences working with that team- they're fast and the quality of work is excellent.
Wish I had a simpler answer for you but I hope that helps.