Thanks! The ranking takes into account the last commit date, the project creation date, the number of forks, stars and open issues, and a couple of other metrics with smaller impact. We will be writing about it soon and showing it on the website :) Also, you can get a few more metrics inside the project view, including github info and npm stats as well as npms ranking (these two are only available for npm packages for obvious reasons :)).

Those ideas are awesome, we will definitely work on providing those two sections and an overall ranking. Thank you once again!