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mempool
Explore the full Bitcoin ecosystem with mempool.space, or self-host your own instance with one-click installation on popular Raspberry Pi fullnode distros including Umbrel, Raspiblitz, Start9, and more!
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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.
Or you can run an electrum server on top of bitcoin core, which is what I do. I use Fulcrum, because it's really easy to install. Then you can point your Electrum wallet (Android or PC) or Sparrow (PC) or BlueWallet (iOS or Android) to your own electrum server.
Umbrel uses core. It's just a package with core and a bunch of apps. It's not a bad package really. You can connect your wallets, open lightning channels, have a private mempool.space, and all kinds of other good stuff.