That's really great, this was needed. It is now necessary to have a place that has the access links for different SE tribes and dApps on Steem Blockchain because of increasing number of them (The idea of Steem Directory is a good one as well, I would be looking forward to it, and what'd its format).
I hope, these site, mentioned/showcased on SteemNavi, are on the basis of the users and on their interesting themes/niche.