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previously: engineer / product, wistia founder, projectpulse.io / clientflow.com
[ my public key: https://keybase.io/gvinter; my proof: https://keybase.io/gvinter/sigs/63fgWE7LORQ0xW-PGiziwa2ZRuxPchzdCMHZBlCU_wM ]
Examples I've seen so far include Intercom and AgileCRM.
EDIT:
I'm going to assume that they all just use the Gravatar API.
Even if I had a template to respond with, it still would take up time. It's strange to get so many emails from people and never to respond, but to be fair, it's the equivalent of cold calling. Do you guys just ignore it too?