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svelte-devtools
A browser extension to inspect Svelte application by extending your browser devtools capabilities
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
There's the Svelte Devtools browser addon that's a bit less robust compared to React's devtools, but it does allow some basic profiling on actions / events with basic information like start/end times of the events, op type, total duration, etc along with the usual component props/state stuff. Not exactly as usable as the react devtools (missing a solid chunk of useful things like 'why did this update' among other tools) but you can see what renders what, how long it takes something to mount, etc.