Off the top of my head, Alteryx is the market leader. It's pretty good but I don't think it supports XML or json (otherwise you could basically build a no-code web app).
The only other one I've tried it MS Power Automate, which is pretty underdeveloped. Lots of opportunities if you want to develop add-ons and extensions but I don't think anyone uses it for anything other than automating SharePoint and Outlook and other things in the MS ecosystem.
The only other one I've tried it MS Power Automate, which is pretty underdeveloped. Lots of opportunities if you want to develop add-ons and extensions but I don't think anyone uses it for anything other than automating SharePoint and Outlook and other things in the MS ecosystem.