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extension
Simple browser extension for managing Polkadot and Substrate network accounts in a browser. Allows the signing of extrinsics using these accounts. Also provides a simple interface for compliant extensions for dapps. (by polkadot-js)
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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 are benefits to installing Polkadot{.js} extension to your browser, even if you are not using it to store DOT or KSM. For instance, it blocks any scam sites it knows about automatically. https://github.com/polkadot-js/extension