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In terms of updating the codebase, bug response, new features etc.
Who are the front runners that at least update at least once or twice a month?
If an altcoin that doesn't even update their codebase or bug responses within a month should not qualify.
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Coin Gecko (https://www.coingecko.com/en) has all sorts of metrics on what coins have active communities/developers. I'm not sure how exactly they measure each of these things, but it may be what you're looking for.
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Test this one:
https://bitcointalk.org/index.php?topic=550165.0 List of all related forums / chats / boards to Bitcoin & Alt-coins & E-money
See, there is a poll, where you can get an activity of users of bitcointalk on side places:
https://bitcointalk.org/index.php?topic=738375 What forums, chats, boards do you use？
It appears to be by the frequency of commits. Seems like it could be gamed with a cron script. – Nick ODell – 2015-06-05T00:58:57.003
// , Yeah, maybe it unintentionally measures the developers who are best at gaming rating systems. – Nathan Basanese – 2015-06-05T05:29:18.073