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devtools
Discontinued Replay.io DevTools [Moved to: https://github.com/replayio/devtools] (by RecordReplay)
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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.
Also, Redux itself is a Swiss army knife. You can put any state in there. That means it can be used for state that only lives in the client, and you can also use it as a place to cache "server state" as well. While it's certainly common to use Redux as a server state cache, there's also lots of reasons to use Redux for state that only ever lives on the client. (We do a lot of that in my day job at Replay.io - our debugger app at https://github.com/RecordReplay/devtools deals with a lot of client-side state.)