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apps
Basic Polkadot/Substrate UI for interacting with a Polkadot and Substrate node. This is the main user-facing application, allowing access to all features available on Substrate chains.
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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.
Even though Polkadot-JS App will show an Ethereum-style address, I don't know if it can actually interact with the Moonriver/Moonbeam networks - I'm seeing a few open PRs/issues which make me think it does not work (e.g. https://github.com/polkadot-js/apps/pull/5216)