The best alternatives to StackStorm are IFTTT, Alloy Automation, and Pipedream. If these 3 options don't work for you, we've listed a few more alternatives below.
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Postman Recorder by DevTools— Export Postman APIs from browser
Alloy Automation is an integrations-as-a-service platform used by the likes of Amazon & Burberry. Founded in 2019, the company is backed by $27M from a16z, Bain Capital Ventures, Y Combinator, and others.
Pipedream is an integration platform for developers, with over 800k customers across 10k companies. Our customers use Pipedream to build automation between over 2000 integrated applications today.