Automatisch (Github repo) is an open-source clone of Zapier that can be self-hosted for greater control over data and allow you to handle your GDPR data processing yourself.
It a Node app that is intended to be used via a Docker wrapper.
I've never been a huge Zapier fan but part of that is having to hand over fairly powerful credentials to third-parties. This approach seems interesting in terms of leaving you in charge of managing those (admittedly still powerful) credentials yourself.
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