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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.
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phoenix
Phoenix is a self-custodial Bitcoin wallet using Lightning to send/receive payments. (by ACINQ)
Yes the wallet itself will only hold funds in lightning channels, but the backend integrates seamlessly with https://boltz.exchange which is a totally non-custodial trustless exchange, meaning they actually never have access to your funds, and facilitate a "submarine swap" either offchain to onchain or onchain to offchain, for small fee.
I prefer https://BlueWallet.io or https://phoenix.acinq.co/